WT-514 - Anonym Part 1: Homepage In CMS

[dchukhin]

If this changeset needs to go into the FXC codebase, please add the WMO and FXC label.

One-line summary

This pull request makes it possible to create an anonym homepage in Wagtail, without styling.

Significant changes and points to review

• bedrock now uses the wagtail-thumbnail-choice-block library
• bedrock/mozorg/models.py now has an AnonymIndexPage
• bedrock/mozorg/blocks/anonym.py has a number of blocks that can be used on the AnonymIndexPage
• bedrock/mozorg/templates/mozorg/cms/anonym/blocks/ has template files for the new blocks
• media/css/mozorg/anonym.scss has CSS for the anonym pages. Right now, it's just mostly icon classes mapped to their URLs, which can be moved to a different file in the future

Issue / Bugzilla link

WT-514

Testing

1. log in to Wagtail
2. choose to create a new page, and choose an Anonym Index Page
3. create the page to match the figma designs from the JIRA ticket. Note: this pull request does NOT include the styles needed to match the designs

[codecov]

Codecov Report

❌ Patch coverage is 98.46154% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.61%. Comparing base (911ca18) to head (c37a58b).

Files with missing lines	Patch %	Lines
bedrock/mozorg/blocks/anonym.py	98.19%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16958      +/-   ##
==========================================
+ Coverage   80.36%   80.61%   +0.25%     
==========================================
  Files         163      164       +1     
  Lines        9100     9230     +130     
==========================================
+ Hits         7313     7441     +128     
- Misses       1787     1789       +2     

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[localjo]

CSS for these components is in progress here: #16966