ReBranding Colors

Make it look a little bit more like our own thing.
Changing background colors - navbar now uses secondary dark and about and next
episode sections use secondary rather than primary.
section
changing modal to appear as separate element

this bothers me that if you're scrolling through the notes, you appear lost in a website of amazing notes and the only way to get out is to reload the website or leave and start the cast over.
reverting modal changes
Merge pull request #19 from refined-bits/rebrand

ReBranding Colors