infobox should link to node subdomain if community provides a corresponding scheme

## Describe the solution you'd like
It would be cool if the h2 (node name) at the top of the #infobox would link to mesh nodes.
We'll probably implement this ourselfs for Aachen at some point. This is just an issue so I remember the idea :)
https://map.aachen.freifunk.net/#!/de/map/0c0e76cf3a42
http://ffac--govegan.nodes.ffac.rocks/cgi-bin/status

as you can see from the example node, certain characters need to be replaced like `#`
Aachen replaces them by `-` but this could be made variable.

Aachen proposes a scheme like:
`nodename`.nodes.`communitydomain`.`tld`