Updated the theme for the site, custom version of Bootswatch - Yeti. Wrote some information for the about page. Gave article list and course list pages a facelift. Tidied up and unified the formatting of the articles.
Updated tests.
Merged with katex additions.
Minor tweak to course styles.
Tweaked fonts, removed dependency on externally loaded font.
Added more content to home and about sections.
Fixes #66, prevents images overeaching site boundaries on mobile.
Merge pull request #65 from MegaPhysics/style_tweaks

Updated the theme for the site, custom version of Bootswatch - Yeti. Wro...