Remove old Python code! :sob: :snake:

[DFurnes]

What's this PR do?

This pull request removes code for Bertly 1.0 (rest in peace!) so that it doesn't confuse anyone.

How should this be reviewed?

:fire: :eyes:

Any background context you want to provide?

We'll always have the good memories!

Relevant tickets

N/A

Checklist

• [ ] This PR has been added to the relevant Pivotal card.
• [ ] Added appropriate feature/unit tests.

[DFurnes]

I'm going to follow this up with some documentation updates too, but wanted to keep those in a smaller PR!