DOC-2608: Add an RSS feed for the TinyMCE Changelog

[FarzadHayat]

Ticket: DOC-2608

Changelog page

RSS Feed: http://docs-hotfix-7-doc-2608.staging.tiny.cloud/docs/tinymce/7/rss.xml

RSS Validator: https://validator.w3.org/feed/
RSS Viewer: https://rssviewer.app/
RSS Spec: https://www.rssboard.org/rss-specification

Changes:

• Worked on this in my own time. Thought it would be a cool feature to have.
• Add Antora extension to tinymce/7 to generate rss.xml during build process
• Automatically updates when changelog.adoc is modified
• Error handling mechanism to ensure build process continues if the extension fails for any reason
• You can test it out by installing an RSS Reader on your smart phone and entering the RSS URL

Pre-checks:

• Branch prefixed with feature/<version>/, hotfix/<version>/, staging/<version>/, or release/<version>/.
• [-] modules/ROOT/nav.adoc has been updated (if applicable).
• [-] Included a release note entry for any New product features.
• [-] If this is a minor release, updated productminorversion in antora.yml and added new supported versions entry in modules/ROOT/partials/misc/supported-versions.adoc.

Review:

• Documentation Team Lead has reviewed

[LewisAtTiny]

I've spent the morning trying to understand RSS feeds and this is actually really cool! Good job Farzad!

[MitchC1999]

Well done! Seems like a nice feature to provide 👍 Should we provide a link to the xml file somewhere in the docs?

[kemister85]

@FarzadHayat Nice work on this, I think we should create a user guide on how to set this up and stick it in the docs under new section?

[soritaheng]

Suggested change

	NOTE: This is the {productname} Community version changelog. For information about the latest {cloudname} or {enterpriseversion} Release, see: xref:release-notes.adoc[{productname} Release Notes].
	NOTE: This is the {productname} Community version changelog. For information about the latest {cloudname} or {enterpriseversion} Release, see: xref:release-notes.adoc[{productname} Release Notes].
	For an RSS feed of the {productname} changelog, use the following URL in any RSS reader: {site-url}/{page-component-name}/{page-component-version}/rss.xml.

@kemister85 @MitchC1999 Rather than a Tip admonition, could we add it here to the Note admonition, and mention the URL can be used in a RSS reader?

[MitchC1999]

I think that would just add it as an extra line rather than a note box. I think its fine to include in a tip box

[MitchC1999]

Just realised this won't run on the main playbook, it's only working on the local playbook build we're publishing on dev branches. This extension will need to be investigated to work with the remote branches and moved to the main branch antora playbook.