Currently, middle-clicking on a hashtag search result will open a new
instance of the WebUI, which is inconsistent with middle-clicking on
an account result, or a hashtag in a toot.

* Adjust footer of getting started column

- Improved style
- Moved hotkeys, about this instance and logout to footer
- Removed FAQ, User Guide, Apps links
- Use hamburger icon for the column

* Add edit profile action button to profile and more to dropdown

* Add "Trending now" to getting started column

* Add preferences/security links on mobile layout