[Feature] Add steps for cleaning up the Docker environment

[mjbear]

Summary

Add steps to detail cleaning up the Docker environment (stop container, delete image).

Changes

• This change would involve more text in the Readme generated in the third workflow.
• The risk is minimal

Additional context

I worked up a PR since I already did the leg work (determining commands) for Docker on my local system.

PR #48

[mjbear]

Additionally,

Would it make sense on the X-finish.md step to link to the MS Learn Introduction to Docker containers module?