* Linux repositories: Document `apt|rpm.grafana.com`
We'll be moving off packages.grafana.com (it will be linked to the new repositories)
The new package repositories are easier to use, so let's document them instead
Question: Are the scripts in `scripts/build/update_repo` and `scripts/verify-repo-update` still used? They seem very old, and seem like the generation of scripts before grabpl was created
* Shorter RPM docs. No need to copy the same snippet twice
* Add warning about repository migration
* oops
