Issue #3415685 by joshua1234511: Add a hidden region for entity references to civictheme.info.yml

[joshua-salsadigital]

https://www.drupal.org/project/civictheme/issues/3415685

Checklist before requesting a review

• I have formatted the subject to include ticket number as [CS-123] Verb in past tense with dot at the end.
• I have added a link to the issue tracker
• I have provided information in Changed section about WHY something was done if this was not a normal implementation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have run new and existing relevant tests locally with my changes, and they passed
• I have provided screenshots, where applicable

Changed

1. Added hidden region at the bottom of the theme with a UI Kit class 'ct-visually-hidden'.
2. Updated stater-kit to include the new region.

Screenshots