Fit certain column's to width.
Markdown heading anchor edits. Cleanup and fix https w/ css/js libs.

Use fa-link instead of fa-paragraph.
Make the heading anchor icon at 66% font-size.
Forgot > in .user-content > :first-child {...}
Fix https css/js.
Use cdnjs for all css/js libraries.
Remove moment.js from clientside (as we don't use it?)
Remove datatables.css that must have gotten added at the beginning.
Use cdnjs for ace.js, bootstrap-markdown, and select2.js
Use a select2 & bootstrap 3 theme which unfortunately isn't on a cdn (we hotlink github pages).
Remove unnecessary bootstrap.css (as the bootswatch theme overloads all of it).
Remove normalize.css as bootstrap.css has a custom version embeded in it.