Add Debug image docs

[mathemancer]

This adds a page to the docs describing our new debug-enabled docker image, and its use.

Technical details

The image in question is the same as the production docker image, except both Gunicorn and Django debugging are enabled. It's designed to let us help users more easily with their docker-based Mathesar setups.

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• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[mathemancer]

@pavish I know you don't have much context here, but I thought you could look through and make sure these new docs are at least coherent since @Anish9901 and @seancolsen are out at the moment.

[pavish]

Looks good to me

[Anish9901]

Looks good @mathemancer, I am assuming that we'd need to build this image each time we make a release. So, It would be good to document the build commands under the release process in the wiki. We would also require building and publishing this image to docker hub for this release, could you take responsibility for that?

[mathemancer]

Looks good @mathemancer, I am assuming that we'd need to build this image each time we make a release. So, It would be good to document the build commands under the release process in the wiki. We would also require building and publishing this image to docker hub for this release, could you take responsibility for that?

Yep, will do.

[kgodey]

Yep, will do.

@mathemancer I added Basecamp tasks for:

• Documenting the process for publishing debug images (to the 0.1.6 release project)
• Actually publishing debug images (to the 0.1.6, 0.1.7 release projects, as well as the release template)

Let me know if that seems okay or if there needs to be more or less tracking.