Flag fallback directory mirrors in Atlas
Tor keeps a list of fallback directory mirrors in its source code.
consensus-health flags these mirrors using the synthetic flag "FallbackDir".
Could Atlas do something like this, too? (Like the Not Recommended flag?)
The list is updated every 2-6 months: https://gitweb.torproject.org/tor.git/tree/src/or/fallback_dirs.inc
And then parsed and included in stem in a friendlier format: https://gitweb.torproject.org/stem.git/tree/stem/descriptor/fallback_directories.cfg
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