Add detailed guide in user documentation on how to submit a Save Code Now request
Current documentation for Save Code Now is quite lightweight and only covers the git
origin case.
However, support for other VCS types (Bazaar, CVS, Mercurial and Subversion) has been added since then and submitting a save request for those is not necessarily straightforward (see swh/meta#5038 (closed)).
We should add a new section in the user documentation explaining how to submit a save request for each supported origin type. This guide should notably cover for each origin type:
- how to find the origin URL expected by Software Heritage for successful loading (with Web UI screenshots of popular forges like GitLab, SourceForge, ...)
- how to verify the origin URL is valid
- how to handle anonymous credentials (for Subversion and CVS)
Once published, a link to that guide should be added to the Save Code Now Web UI.