docs(users/Profpatsch): Add small README to most subdirs

Change-Id: I2912e32fe1b2d3d3aff7bafba809634ec4c9adb6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8470
Autosubmit: Profpatsch <mail@profpatsch.de>
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI

users/Profpatsch/reverse-haskell-deps/README.md

@@ -0,0 +1,3 @@
+# reverse-haskell-deps
+
+Parse the HTML at `https://packdeps.haskellers.com/reverse` to get the data about Haskell package reverse dependencies in a structured way (they should just expose that as a json tbh).

users/Profpatsch/reverse-haskell-deps/default.nix

@@ -23,7 +23,7 @@ let
         pkgs.haskellPackages.nicify-lib
         pkgs.haskellPackages.tagsoup
       ];
-
+      ghcArgs = [ "-threaded" ];
     }
     ./ReverseHaskellDeps.hs;