Fold the standalone rsync-web repo into the rsync source tree as
rsync-web/, eliminating the sibling-checkout convention and the
drift it causes between the release-time HTML snapshot in
../release/rsync-html and the source of truth in ../rsync-web.
Flat-copy import (no git history merge). The standalone repo at
github.com/RsyncProject/rsync-web is retained for historical
reference and will be archived once the in-tree copy proves itself.
Add /rsync-web/ to .gitattributes with export-ignore so the
website content does not bloat the release source tarball
produced by 'git archive' in packaging/release.py step_7_tarball.
A follow-up commit repoints HTML_SRC in packaging/release.py at
the new in-tree location.
