Hi Olof, welcome to forge friends! Contributing to open source is quite satisfying wherever you are engaged with, and you sure come with the right spirit. It doesn’t matter what one contributes, rather that one contributes, and in open source you do that on those things where your passion lies. Learn by doing, teach and be taught, and just have fun along the way 
There’s plenty things that can be done within this community. It has a rather unique structure as FOSS projects come, as any member can initiate anything as long as there’s community consensus. On lending help on technical tasks you best consult @dachary and @pilou and join the monthly meetup. Other than that just go through some forum topics and check the repo’s and open issues.
There’s a bunch of stuff to be done on web-dev side as well, such as revamping the project website (based on Go Hugo) now the project is renamed.