rethink the overall theme

[kohlhase]

the left hand column uses a lot of space.

[ComFreek]

Do we eventually want a multi-page website with menus and so on? If so, I think we should switch to a Travis-built GH pages set up (similarly to uniformal.github.io).

[kohlhase]

That is true. But we should keep it simple.

[ComFreek]

In fact we don't need any CI server - we can use any external theme we like (search for "jekyll theme" on Google) and overwrite selected files in our repository.

I've now done this for the Leapday theme I chose some days ago: https://uframeit.github.io/

However, the Leapday theme is pretty outdated wrt. its dependencies. It works for now. We should either update it manually (I can fork it, I like the design anyway) or choose another theme (easier). If anyone comes across a better theme, let me know.

PS: Had to recombine the split pages since the current theme handles subpages with bad UX (lack of menus).