#7531 - BE Mozfest Hero Updates

[SharmaineLim]

Closes #7531
Related PRs/issues #7432 (Epic)

Link to sample test page: (no staging site)

Implementation Checklist

• Editor can add a heading
• Editor can add a CTA label and link (Discussed with Jeth, the CTA will scroll down to the video)
• Editor can specify 3 (no more, no less) subheadings each with their own heading, plain-text copy, and associated image
  • I kept the minimum number at zero so that the field isn't hard-required
• Editor can specify an embedded YouTube video OR video in Wagtail

Of note

• Bump https://github.com/torchbox/wagtailmedia to 0.8.0 to use VideoChooserBlock

Checklist

Remove unnecessary checks

Changes in Models:

• Did I update or add new fake data?
• Did I squash my migration?

Documentation:

• Is my code documented?

Screenshots

Editor page up to body (with CMS-managed video)

Banner video chooser

Banner video from Youtube/Vimeo

[b-ggs]

Looks good to me!