Prideraiser attachment

[galenriley]

• Replace video on Home screen with "video" or "prideraiser" type Hero content (sets us up to easily add a still banner image later)
• Implement axios wrappers for prideraiser.org API
• Implement Prideraiser Match Update attachment type
• Various refactoring and tidying, esp tidying of Settings.js

This all works, but the Prideraiser bits could use more styling work, which my brain is not well suited to visual design right now. There's a lot of work here that I want to carry over to the navigation upgrade/refactor and SDK update, so making the PR before it's perfect.

[tacoman]

Code reviewed but not tested- I assume it's working on your end. Let me know if you want us to push it to Guardbook beta and ask our testers to give it a deeper look.