Improvements to Web UI.

* [UI,FIX] Aligned menu horizontally.
* [UI,EXT] Added 'home' button to menu.
* [UI,SC] Reordering of menu.
* [UI,NEW] Added 'Simulation' menu entry.
* [UI,SC] Renamed 'Connections' to 'Sharing'.
* [UI,SC] Removed user from 'Settings'; already appears on 'Sharing'.