This is part of [GitLab Support efforts to improve Geo & HA documentation](https://gitlab.com/groups/gitlab-org/-/epics/2960). 1. [ ] Reorganise [existing Gitaly page](https://docs.gitlab.com/ee/administration/gitaly/index.html): - Outline - Introduction - History - Architecture - Configuration - Running Gitaly on its own server - Troubleshooting Gitaly 1. [ ] Add new content - Topics - Scaling: Single standalone server - Scaling: Multiple Gitaly servers - HA: Praefect - Managing repository sharding