Check all minisite_url values using upcoming fontbakery check

We should check all existing METADATA files and fix them if they have problems per the upcoming https://github.com/fonttools/fontbakery/issues/4504 fontbakery check, once that check is implemented.

I'm assigning to @vv-monsalve as I expect @felipesanches can turn that around with a couple of business days which will be at the start of vv's Repo Maintainer rotation next week, IIRC :)