Refactor diversity page into wagtail blocks

[zoombear]

Is your feature request related to a problem? Please describe.
Wagtail's streamfield allows us to create "blocks" that are configurable on the website backend and add them to pages. We could/should take all the html sections in our templates and turn them into reusable blocks.
https://docs.wagtail.io/en/v2.5/topics/streamfield.html#structblock

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Additional context
This will require architecture and code. Work with @zoombear since she's done this before on a wagtail project and can provide guidance!