Spruce up some code

Add .idea to .gitignore to allow WebStorm development, add closing
characters to div and link closing tags, add middot to page titles, add
active class to navbar, refactor custom CSS into its own file. I love
the site's colour scheme @xClone84 :D
Remove accidentally committed IDE files

Remove accidentally committed files pertaining to JetBrains WebStorm
preferences.
Merge pull request #1 from psgs/master

Spruce up some code