Large scale website redesign update thing

- Updated lots and lots and lots of CSS
- Changed all link colors from orange to black and underlined
- Made site more accessible across the board
- Seriously, look at all the pages and tell me it's not awesomer
- Updated relevant HTML in pages to accomodate
- Changed en.yml Developer Guides translated string to yes (why was it not already?)
- Added images to the Using Monero page for wicked sick purposes