Documentation for integrating with already existing databases

[Gabisonfire]

Instead of spinning up a new container and having everything self contained.

[purple-emily]

So #46 did a lot of the work regarding this. Simply changing the one set of environment variables does a lot of the work.

Documentation needs to be done that simply highlights which parts of the compose file need to be deleted/commented out.

This could also be tied to #33 because the depends on anchors can make it a little complicated at first glance to see the “depends on”, etc.

There’s a balance between duplicating lines and readability here. If only you could toggle services on and off with an environment variable with compose.