Add "title" to the h1 tags

This is because soupault couldn't pick the proper h1 tag to create the
<title> tag from, which became a problem with the css change.
Remove old css file, and font files
Use simple.css instead of the previous css file

I cobbled the old one together from different places on the internet,
but I like this one more.

Add build manifest

Yay for builds.sr.ht \o/
Add sitemap plugin
Change how published date is written

This is to hopefully make it easier to write a sitemap plugin
Remove old "noreferrer" attribute from check_links widget
Fix link to git repo
Add check_links widget and related writing
Initial commit.