[Debian-salsa-ci] Salsa project page facelift

[Otto Kekäläinen]

Hi!

I did minor updates to https://salsa.debian.org/salsa-ci-team/pipeline

- Changed project name from "pipeline" to "Salsa CI pipeline for Debian"
- Added a makeshift logo to make it a bit more appealing
- Wrote new project description: Salsa CI is the official CI pipeline
for salsa.debian.org. Anyone can use it to assure quality of Debian
packages before they get uploaded to official Debian repositories. See
README for instructions.


Let me know what you think. I can revert to the old if you think this
is not a clear improvement.