Font sizes and search height

- Changed font sizes for the header, description
- Evened out the search bar's height, font-size for all it's components
- Changed font sizes for repo name and link
- Added a border separator between them
- Added primary and secondary color variables
- Increased spacing between results
- Changed the syntax Hightlight bg to be a lighter version of secondary
- Reduced width of code snippets
Merge pull request #1 from ssrihari/style-foo

Font sizes and search height