Reset django migrations, document upgrade

[mathemancer]

This PR:

• Resets the Django migrations completely
• Adds documentation to help the user understand the implications of that migration reset, and help them "upgrade" from previous versions of Mathesar.

Technical details

The documentation walks the user through knocking out their old mathesar_django database, recreating it, and then proceeding with the upgrade.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the develop branch of the repository
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• 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]

@kgodey You might want to read through the "upgrade" docs portion of this PR.

[pavish]

@mathemancer We would be moving to a different repository in Docker i.e. mathesar/mathesar instead of mathesar/mathesar-prod, so this wouldn't work.

We would have to ask users to modify their docker-compose file or get the latest one from our repo.

[mathemancer]

Good catch, thanks

[Anish9901]

Looks good overall, I've made minor suggestions that needs your attention @mathemancer.

[Anish9901]

We don't install/update any functions using install.py anymore, I am skeptical whether we even need this step.

[mathemancer]

You're right. Removed!

[mathemancer]

Okay, I'm going to merge this in interest of time. @kgodey We can add more docs updates to the release branch after it's cut.