Cleanup

// HTML - CSS
Blog icon in footer
Generic class for content page (faq/tos/download)
Correct html5 closing tags
Move favicon into images folder
Change navigation according to the page
Move javascript into the end of pages
TOS page design
Convert images into jpg instead of png

// PHP improvements
require_once instead of include for config file
array_key_exists instead of isset for an array
Use of constants instead of variables

// Misc
Better url rewriting