Add path based redirect

[noxilixon]

Added a shorter path based redirect to knoteninfo. Before you needed to type e.g. https://util.berlin.freifunk.net/knoteninfo?knoten=linie206-core&typ=wiki to get a redirect to the wiki based on the node name. Now you can use ff.berlin/d/linie206-core. These are two improvements:

1. Links are shorter. That way they can even be written on a device for documentation (see ff-sticker).
2. Links are more generic. We don't write which service exactly we want (e.g. wiki for documentation) but say that we want the documentation of the node. Then you will be redirected to the service we currently use for it. Making it easy to migrate to an other service in the future.

d (documentation) -> wiki
m (map) -> hopglass
s (statistics) -> monitor

[noxilixon]

I did not work with php and apache before. Used a lot of online help. Please give feedback and review carefully.

[noxilixon]

Linting is failing. Mostly because of the old code. I think there is a little rewrite needed. I could do it, but maybe its easier for other people. Or we ignore it.