Cleanup Jekyll warnings

Summary

There is a number of Jekyll and Liquid warnings in the build output. It would be nice to clean them up

C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org>bundle exec jekyll serve --config '_config.yml,_config-3.x.yml
Configuration file: C:/Users/Oleg/Documents/opensource/wiremock/wiremock.org/_config.yml
Configuration file: C:/Users/Oleg/Documents/opensource/wiremock/wiremock.org/_config-3.x.yml
To use retry middleware with Faraday v2.0+, install `faraday-retry` gem
            Source: C:/Users/Oleg/Documents/opensource/wiremock/wiremock.org
       Destination: C:/Users/Oleg/Documents/opensource/wiremock/wiremock.org/tmp/site_3x
 Incremental build: disabled. Enable with --incremental
      Generating...
       Jekyll Feed: Generating feed for posts
C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/json-1.8.6/lib/json/common.rb:155: warning: Using the last argument as keyword parameters is deprecated
    Liquid Warning: Liquid syntax error (line 1): Expected dotdot but found id in "(page.header.overlay_color or page.header.overlay_image) or page.header.image" in C:/Users/Oleg/Documents/opensource/wiremock/wiremock.org/_layouts/splash.html
    Liquid Warning: Liquid syntax error (line 1): Expected dotdot but found id in "(page.header.overlay_color or page.header.overlay_image) or page.header.image" in C:/Users/Oleg/Documents/opensource/wiremock/wiremock.org/_layouts/single.html
    Liquid Warning: Liquid syntax error (line 1): Expected dotdot but found id in "(page.header.overlay_color or page.header.overlay_image) or page.header.image" in C:/Users/Oleg/Documents/opensource/wiremock/wiremock.org/_layouts/archive.html
    Liquid Warning: Liquid syntax error (line 1): Expected dotdot but found id in "(page.header.overlay_color or page.header.overlay_image) or page.header.image" in C:/Users/Oleg/Documents/opensource/wiremock/wiremock.org/_layouts/support.html
Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div(1, 4) or calc(1 / 4)

More info and automated migrator: https://sass-lang.com/d/slash-div

    ╷
136 │     gutters: 1/4,
    │              ^^^
    ╵
    _variables.scss 136:14                                                              @import
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\assets\css\main.scss 11:9  root stylesheet
Deprecation Warning: Passing a string to call() is deprecated and will be illegal in Dart Sass 2.0.0.

Recommendation: call(get-function(mixin-exists))

   ╷
70 │         $_pass: call(unquote("#{$_type}-exists"), $_i);
   │                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\output\support\_support.scss 70:17    susy-support()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\output\support\_box-sizing.scss 12:9  susy-box-sizing()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\output\support\_support.scss 40:5     susy-support()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\output\shared\_output.scss 12:5       output()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\language\susy\_box-sizing.scss 21:28  global-box-sizing()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\language\susy\_box-sizing.scss 35:3   border-box-sizing()
    _reset.scss 5:1
  @import
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\assets\css\main.scss 16:9
  root stylesheet
Deprecation Warning: Passing a string to call() is deprecated and will be illegal in Dart Sass 2.0.0.

Recommendation: call(get-function(variable-exists))

   ╷
70 │         $_pass: call(unquote("#{$_type}-exists"), $_i);
   │                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\output\support\_support.scss 70:17    susy-support()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\output\support\_rem.scss 17:7         susy-rem()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\output\support\_prefix.scss 17:5      susy-prefix()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\output\support\_box-sizing.scss 16:7  susy-box-sizing()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\output\support\_support.scss 40:5     susy-support()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\output\shared\_output.scss 12:5       output()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\language\susy\_box-sizing.scss 21:28  global-box-sizing()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\language\susy\_box-sizing.scss 35:3   border-box-sizing()
    _reset.scss 5:1
  @import
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\assets\css\main.scss 16:9
  root stylesheet
Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($value, 16px) or calc($value / 16px)

More info and automated migrator: https://sass-lang.com/d/slash-div

   ╷
28 │     @return $value / 16px * 1em;
   │             ^^^^^^^^^^^^^
   ╵
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\breakpoint\_helpers.scss 28:13
base-conversion()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\breakpoint\_helpers.scss 20:13
breakpoint-to-base-em()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\breakpoint\parsers\single\_default.scss 8:29  breakpoint-parse-default()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\breakpoint\parsers\_single.scss 22:14
breakpoint-parse-single()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\breakpoint\_parsers.scss 153:18
breakpoint-parse()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\breakpoint\_parsers.scss 48:22
breakpoint()
    vendor\breakpoint\_breakpoint.scss 46:16
breakpoint()
    _reset.scss 13:3
@import
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\assets\css\main.scss 16:9
root stylesheet
Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($span-sum, $context) or calc($span-sum / $context)

More info and automated migrator: https://sass-lang.com/d/slash-div

    ╷
156 │       $width: percentage($span-sum / $context);
    │                          ^^^^^^^^^^^^^^^^^^^^
    ╵
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\language\susy\_span.scss 156:26  get-span-width()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\language\susy\_span.scss 45:11   span()
    _utilities.scss 163:24                                                                                           @content
    vendor\breakpoint\_breakpoint.scss 66:7                                                                          breakpoint()
    _utilities.scss 162:3                                                                                            @import
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\assets\css\main.scss 19:9                               root stylesheet
Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($-gutters, susy-sum($-columns, $-gutters, $-spread)) or calc($-gutters / susy-sum($-columns, $-gutters, $-spread))

More info and automated migrator: https://sass-lang.com/d/slash-div

   ╷
80 │       $_gutter  : percentage($_gutters / susy-sum($_columns, $_gutters, $_spread));
   │                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\language\susy\_gutters.scss 80:30   get-gutter-width()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\language\susy\_gutters.scss 100:25  get-gutters()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\language\susy\_span.scss 70:13      span-math()
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\language\susy\_span.scss 13:12      span()
    _navigation.scss 35:13
@content
    vendor\breakpoint\_breakpoint.scss 66:7
breakpoint()
    _navigation.scss 34:9
@import
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\assets\css\main.scss 25:9
root stylesheet
Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($context, $n) or calc($context / $n)

More info and automated migrator: https://sass-lang.com/d/slash-div

   ╷
24 │   $line         : floor($context / $n);
   │                         ^^^^^^^^^^^^^
   ╵
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\_sass\vendor\susy\susy\language\susy\_gallery.scss 24:25  gallery()
    _archive.scss 130:5                                                                                                @content
    vendor\breakpoint\_breakpoint.scss 66:7                                                                            breakpoint()
    _archive.scss 129:3                                                                                                @import
    C:\Users\Oleg\Documents\opensource\wiremock\wiremock.org\assets\css\main.scss 33:9                                 root stylesheet
Warning: 7 repetitive deprecation warnings omitted.
Run in verbose mode to see all warnings.
C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/json-1.8.6/lib/json/common.rb:155: warning: Using the last argument as keyword parameters is deprecated
                    done in 9.249 seconds.
 Auto-regeneration: enabled for 'C:/Users/Oleg/Documents/opensource/wiremock/wiremock.org'

References

No response