Description

I don't believe there's anything using the Contentul HTML templates in https://github.com/mozilla/bedrock/tree/main/bedrock/contentful/templates/includes/contentful

Removing these also means we can remove quite a large number of unused CSS bundles:

https://github.com/mozilla/bedrock/blob/main/media/static-bundles.json#L955-L1044

Success Criteria

• Unused Contentful templates and bundles are removed from the codebase
• Contentful Python code removed
• Redirects updated (which were in the Python code for Contentful-managed pages)
• All unit tests passing
• Integration tests passing