I noticed that https://we.phorge.it/ has not a footer with a default license, and this is a problem since as default the contents are technically "all rights reserved by respective authors", and so it means that collaboration is not legally enabled.
Proposed footer:
> Public contents are in [[ https://creativecommons.org/licenses/by-sa/4.0/ | Creative Commons Attribution-ShareAlike 4.0 (CC-BY-SA) ]] unless otherwise noted.
Assuming the same license of Wikipedia and StackOverflow seems reasonable and implicit.