squashed from https://gitlab.com/famedly/conduit/-/merge_requests/604
added differences.md
Co-authored-by: Charles Hall <charles@computer.surgery>
Co-authored-by: strawberry <strawberry@puppygock.gay>
Signed-off-by: strawberry <strawberry@puppygock.gay>
these database backends are either unmaintained, broken in conduit, or
incredibly niche for something like conduwuit.
also i want to bump the MSRV.
Signed-off-by: strawberry <strawberry@puppygock.gay>