Menu styling #61

Menu could use improvement

• Top menu is large, could be same size as on maproulette.org or smaller.
• Maybe adjust outline menu styling slightly, ie. bullet list or similar to separate some page links better.
• Outline menu is very long. Could be collapsible.
  (while keeping it keyboard-friendly of course)
• When clicking on a page link, the menu remains at the default position. It could go to the relevant page/section in the list.
• The current page link could be highlighted in lightgreen or similar as it is when hovered.
• There are no previous/next buttons within the page for easy navigation.
• Maybe cut out further unrelevant parts of screenshots, make them smaller, or add a 'view large image' button.