Cleanup style

This is a mild restyling of OpenStreetMap. Changes include:

  * Remove margin from map, add more margin to text content
  * Rearrange permalink & link buttons and gives them a background
  * Pull OpenStreetMap text below logo along with subtitle
  * Simplify sidebar styling
  * Move towards a baseline, start to consolidate text size and line height

This is tested with LTR, RTL, and the compact mode, and looks good. Looks
more uniform in older browsers because it relies less on round corners.