New layout

This MR finally revises the layout of the different apps.

closes #110 (closed), #106 (closed), #101 (closed), #88 (closed), #77 (closed), #41 (closed), #40 (closed), #30 (closed), #22 (closed), #17 (closed), #16 (closed), #109 (closed)

@geyer, I'll let you know when this is available on the playground