doc: add release notes to standalone doc bundle

This is a workaround for #101714 on top of being a useful addition
in its own right. It is intended to change the "canonical URL"
for viewing the release notes from GitHub, which is relatively
slow, to a pre-rendered HTML file that loads from the same CDN
as the standard library docs. It also means you get a copy of
the release notes when installing the rust-docs with rustup.

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