Changelog page and release history

[edwinvakayil]

A dedicated place to read what is new in each release, with clear dates and version labels.

• A changelog page you can open from the site navigation to see release notes in one place.
• Entries grouped by change type (for example Added, Updated, Fixed) so updates are easy to scan.
• Each release shows the date, version, summary, and bullet list of what changed.
• Minor UI improvements.

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This discussion was created from the release Changelog page and release history.