Feature/2224 dark quote block be

[kevinhowbrook]

Description

Based off #11547 with cherry picks from #11539

Adds a new dark single quote block

Link to sample test page: run inv new-env and view http://mozfest.localhost:8000/en/

Related PRs/issues: https://torchbox.monday.com/boards/1334760528/pulses/1336802224

Checklist

Tests

• Is the code I'm adding covered by tests?

Changes in Models:

• Did I update or add new fake data?
• Did I squash my migration?
• Are my changes backward-compatible. If not, did I schedule a deploy with the rest of the team?

Documentation:

• Is my code documented?
• Did I update the READMEs or wagtail documentation?

Merge Method
💡❗Remember to use squash merge when merging non-feature branches into main

[kevinhowbrook]

Needs rebasing

[tbrlpld]

I think I raised the question when looking at the frontend, but I am still not sure I understand why this is a completely detached element. It might be worth documenting the why of the decision.

Code looks fine. Just left some clarifying questions.