UHF-3511: Add user-edited-content class to wrap custom html

[jeremysteerio]

UHF-3511

Add user-edited-content class to wrap custom html.

What was done

• Add user-edited-content class to templates where custom (editor-written or imported) html is displayed
• Add styles for the class

How to install

• Make sure your instance is up and running on latest dev branch.
  • git pull origin dev
  • make fresh
• Update the HDBT theme
  • composer require drupal/hdbt:dev-UHF-3511-user-edited-content-class
• Run make drush-cr

How to test

• Add landing page or standard page
  • Add some paragraphs to it you know contain custom HTML fields (long text fields with ckeditor)
  • Inspect the page where the custom HTML is, it should be wrapped with user-edited-content
• Read code, can you think of any other places where there is custom HTML?

Designers review

• This PR does not need designers review
• This PR has been visually reviewed by a designer (Name of the designer)

Other PRs

• Rekry

[Arkkimaagi]

Code looks good and harmless, approved.