Backport #27930 by @lng2020
The bug has been fixed for several months in the
`docker/build-push-action`
The fix commit is
[d8823bfaed](d8823bfaed)
as the Gitea Actions Doc mentioned too.
Co-authored-by: Nanguan Lin <70063547+lng2020@users.noreply.github.com>
This PR cleans up the docs in a way to make them simpler to ingest by
our [docs repo](https://gitea.com/gitea/gitea-docusaurus).
1. It includes all of the sed invocations our ingestion did, removing
the need to do it at build time.
2. It replaces the shortcode variable replacement method with
`@variable@` style, simply for easier sed invocations when required.
3. It removes unused files and moves the docs up a level as cleanup.
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Signed-off-by: jolheiser <john.olheiser@gmail.com>
