[Debian-salsa-ci] Salsa and Salsa CI documentation

[Otto Kekäläinen]

Hi all,

In case you haven't noticed, I am updating the README and general
documentation with Ahmed in
https://salsa.debian.org/salsa-ci-team/pipeline/-/merge_requests/519

I have also submitted a bunch of MRs to other places in Debian to
better mention Salsa and Salsa CI. Please +1 them by clicking the
thumbs up icon if you want to support them being merged:

https://salsa.debian.org/ddp-team/debian-faq/-/merge_requests/9
https://salsa.debian.org/webmaster-team/webwml/-/merge_requests/992
https://salsa.debian.org/debian/debmake-doc/-/merge_requests/25
https://salsa.debian.org/mentors.debian.net-team/debexpo/-/merge_requests/217

Thanks!