[META] Fix SDDS theme errors

It's not just base theme.

These aren't critical for the demo so moving to postponed for now.

Since we don't need any of the sitebuilding stuff for Barcelona and these errors are due to sitebuilding features, keeping this postponed.

kristen pol → credited joshua1234511 → .

Fixed via child issues.

Note this new one for later:

📌 [META] Determine SDDS sitebuilding approach with XB and Drupal CMS Postponed

Automatically closed - issue fixed for 2 weeks with no activity.