Add backup git mirror

Merged dsc requested to merge dsc/monero-site:mirror-git into master

Adds a Gitea git mirror of the monero repo to the downloads page because the more the merrier.

21:27 < dsc_> sarang, moneromooo:
21:28 < dsc_> I've set it to update every 5 minutes
21:30 < moneromooo> Thanks.
21:34 < moneromooo> Hrm. I just look at how to add a link to it to the site, but the text seems separated in several places and I quickly lost interest. If anybody else wants to, feel free... looks like some mix of _i18n/en.yml and _data/downloads.yml.
Edited by dsc

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