tag2upload no longer needs per-repo webhook configuration

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We now hsve a global webhook on Salsa.

New users of tag2upload no longer need to mess about with Salsa
configuration.  (I've updated the wiki accordingly, deleting the part
about setting up a webhook.)

If you have been using tag2upload and have configured a webhook in
your repositories, you can now delete that webhook.  (Or you can leave
it there - it's harmless, other than a minor performance impact.)

Thanks to Thomas Goirand for the Salsa configuration change.

(tag2upload allows DDs and DMs to upload simply by using the
git-debpush script to push a signed git tag.  tag2upload is currently
in beta.  See https://wiki.debian.org/tag2upload for more details.)
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