[Docs Site] Remove search bar

Site: http://restify.com/ Browsers tested:

• Chrome (62.0.3202.62 (Official Build) (64-bit))
  • Chrome private browsing
• Firefox Developer Ed.
• Safari (Version 11.0 (11604.1.38.1.7)) OS: macOS 10.11.6 El Capitan

Repro steps:

• Navigate to http://restify.com/ in your browser
• Type text into searchbox in upper right
• press enter/return on keyboard, or
• click magnifying glass icon

Expected result:

• search is initiated by pressing enter/return on keyboard while search input field is focused
• search is initiated by clicking on magnifying glass icon

Actual result:

• enter/return on keyboard does nothing - search not initiated