Fix project templates and add docs

What does this MR do?

Fix project templates, see linked issue

Are there points in the code the reviewer needs to double check?

The way I merge the param in the hash

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• [-] API support added
• [-] Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database

What are the relevant issue numbers?

Fixes #36492 (closed)

/cc @filipa