Bug Report

Environment

Zola version: zola 0.16.1

Expected Behavior

This front-matter should parse successfully (see https://www.yamllint.com/ for an example of another tool that can parse it; this was originally migrated from a Jekyll site which can also parse it):

---
layout:	post
title:	"Hosting an SSH Server"
date:	"2017-12-27 20:46:24 -0500"
excerpt: I decided one day that I really wanted a remote server.
audience: tech-savvy
---

Current Behavior

PS C:\Users\jyn\src\third-website> zola serve                     
Building site...
Error: Failed to serve the site
Error: Error when parsing front matter of section `\\?\C:\Users\jyn\src\third-website\content\blog\2017-12-27-Hosting-an-SSH-Server.md`
Error: Reason: YAML deserialize error: Error("failed to parse datetime", line: 2, column: 1)

I think the problem is that dates are unconditionally parsed as toml dates, which is not correct: https://github.com/getzola/zola/blob/39bfbcd0199340ce5de4d0b951a2050cc9fc239e/components/content/src/front_matter/page.rs#L31-L33

Step to reproduce

Add the given frontmatter to any .md file in content/blogs.