Added some related communities to the sidebar - maybe others could be added?

Not Meta-Facebook, though it has to do with them too "<.<

In the discussion of the announcement of !DeMeta@lemmy.world, pertaining here, it was suggested to add the DeMeta community and !deGoogle@discuss.tchncs.de to the sidebar here. It sounded like an interesting idea, as they can give directions within their specific scopes to how to deshittify, so added them I have.

Any more that could be added?