Have an official upstream Git repository for DAVE

So far on https://git-tails.immerda.ch/ I only see one repo for DAVE: ma1/download-and-verify-extension.

If we end up with more people than Giorgio working seriously on this code, then it would be good to have a master repo that would be consider “upstream”, no?

And named accordingly. Maybe https://git-tails.immerda.ch/download-and-verify-extension/.

Related issues

Related to #8531 (closed)

Original created by @sajolida on 12582 (Redmine)

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