ci: link release notes to the English changelog pages

The links were written before the English pages existed, so GitHub and Modrinth
sent an international audience to Japanese notes. Both now point at the English
pages; the Japanese ones remain reachable from the site's own locale switch.

Also stops the changelog template from being served. It lives under `src/`, so
VitePress published it as a page of empty headings at /assets/changelog-default,
where it was reachable and indexable. `srcExclude` keeps it a template.

The tag table on the changelog overview claimed `vX.Y.Z` was last used for
v1.0.0 and retired, which contradicts release.yaml and the release skill still
supporting it; it now says what the tag is for.

Co-Authored-By: Claude <noreply@anthropic.com>

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