Docs update: update Docker Compose Installation guide
Created by: abeatrix
PR will be continue in https://github.com/sourcegraph/sourcegraph/pull/39786
The installation guide for Docker Compose is currently too long with information that is beyond the installation steps: https://docs.sourcegraph.com/admin/deploy/docker-compose
This PR:
- fixes the formatting
- moves the current management-operations section to a new page
- fix broken links
- removes unnecessary information
- add new commands
Test plan
App preview:
Check out the client app preview documentation to learn more.