As discussed on the devel mailing list, advertise the roadmap 2021 to the docs.s.o site currently held in a hedgedoc link.
```
> For the same reason I love your idea of putting it under docs.s.o, but I
> think it'd be fine under docs.s.o/devel/roadmap , linked from somewhere
> among the initial links at the index of docs.s.o/devel/. Any takers?
```