Add Docker example for self-hosting db dump script (#58)

* Add Docker example for self-hosting db dump script

Added Docker usage example for self-hosting the bot.

* Improve formatting of Docker example in scripts.md

Reformat Docker usage example for clarity.

---------

Co-authored-by: Isaac <git@eartharoid.me>

Author: blue-belle

docs/self-hosting/scripts.md

@@ -19,6 +19,8 @@ This is not an efficient backup method; it is intended for converting between da
     ```bash linenums="0"
     pnpm db.dump
     ```
+!!! example "Docker"
+    When self-hosting the bot using Docker, you can use `docker exec` to attach to the container. `docker exec -it [CONTAINER NAME] sh` will create an interactive shell, from which you can `cd` into `/app` and run the `db.dump` command.
 
 ### `db.prune`