Remove sidebar, simplify view

[jancborchardt]

• Remove tag list from sidebar
• Remove sidebar, move add event button to content
• Move statistics from sidebar into possible front page head section, commented out

Separate things to do

• The "Add new event" button now shows on every page now, including the "Add new event" page :D What to do here? Is there a specific "Frontpage" template?
• Similarly we need to think about how to handle a possible frontpage graphic, possibly using the main statistic. Not sure where to put that.
• The content of the "About" page and the sidebar is slightly different for some reason? Which is the latest version? @tyranja?

Before & after:

[tyranja]

But now the content of the sidebar is gone, where will it go to?

Not sure why the about page and the sidebar are different :woman_shrugging: I guess the sidebar is supposed to have less information.

[tyranja]

@alicetragedy @jancborchardt should I merge that? ( sorry, was pretty busy and totally forgot about thet PR )

It would be cool to have some topics of the sidebar back.