Feature: Give option to hide/show elements

[minthemiddle]

Give the option via config to show/hide different elements:

1. Ends at display
2. Intention
3. Start button
4. + x min buttons

[minthemiddle]

Depends on #6 so that start/stop can be hidden and app still is usable.

[minthemiddle]

Depends on creating a settings overlay.
Either via #3 or create here and use in #3

[minthemiddle]

Easiest would be a shortcut to toggle all extra elements.
That would toggle between full and compact mode.
Compact mode would be similar to n10 then.