Add a docker compose example. (#1882)

* Add a docker compose example.

Using postgresql and with traefik specific labels.

* Added docker-compose specific documentation.

* Move docker-compose section at the end of the README.md.
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f