Feat: Add Reference Docs Versioning

[buzzamus]

Summary of changes

• This PR moves Dokka output off of the main branch (docs/) and into a git ignored build directory, then publishes it to a separate reference-docs branch via the new publish-docs.sh script.

A follow up PR to generate the docs will follow once this is merged to remove docs/ and then switch over to new docs.

• to test/preview docs you can follow these steps locally:

1. run the publish script with ./scripts/publish-docs.sh 5.30.0-test
2. preview the docs in the browser (an easy way to set up a local server is with python3 -m http.server 8000 and then go to http://localhost:8000/ → should redirect to current/index.html and then also try http://localhost:8000/5.30.0-test/

AI Usage

Which AI Agent Was Used?

• Copilot
• Claude
• Other (Type Name Here)

How was AI used?
Used for initial research, creating bash script to mimic iOS docs behavior

Estimated AI Code Contribution

• less than 30%
• 30 - 60%
• 60 - 100%

Checklist

• Added a changelog entry
• Tested and confirmed payment flows affected by this change are functioning as expected

Authors

List GitHub usernames for everyone who contributed to this pull request.

• @buzzamus

[github-actions]

Dependency Review

The following issues were found:

• ✅ 0 vulnerable package(s)

See the Details below.

Scanned Files

• settings.gradle