WT-334 - Build CMS Components For Advertising Pages - Part 2

[dchukhin]

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

This pull request depends on #16813, which should be reviewed first

One-line summary

This pull request makes the advertising principles subpage editable through Wagtail.

Significant changes and points to review

Following the work in #16813, this pull request adds an AdvertisingPrinciplesPage with the fields necessary to make it editable through Wagtail.

Issue / Bugzilla link

WT-334

Testing

To test locally, go to Wagtail and create an "Advertising principles page" page in the page tree (as a child of an "Advertising index page"). Try to make the content identical to http://localhost:8000/en-US/advertising/principles/.

[kkellydesign]

Let's make this one a little more generic. Call this page type a "Two-column subpage." The child pages for the Advertising section will be this one, and another that is more component-based like the index page. I've merged our other work on this here: http://localhost:8000/en-US/advertising/solutions/ (For now, this is unneccessary context, as these additional two subpages aren't yet approved.)

I'll also add that I just merged in Luciano's work, and then reverted that commit because I realized it's still in flux. So in an effort to keep your branch clean, it's now only updated with main.

This page will eventually be used for the contact page as well (Luciano's branch is live on the demo server right now awaiting review.), so we'll need the right column to accept a form, and/or an embed. Again, this isn't fully specced yet, so no need to build anything for this yet.

So for this PR:

• Change the PageType name to "Two-column subpage"
• Make the right column a streamfield that accepts a normal richtext field, and also your current model fields as a "Detail List" component.