[Installation Support Idea] Make this guide a Docker Compose File

[matrixbot]

This issue has been migrated from #13895.

---

Description:

This guide is a basic setup that most people starting their own server would be aiming to achieve. Make a docker compose file for this setup. Link it in this guide. A docker compose file would answer most the questions people have about a setup.

https://matrix.org/blog/2020/04/06/running-your-own-secure-communication-service-with-matrix-and-jitsi