chore(users/Profpatsch): bring reverse-haskell-deps into shape

Add a cabal file and move into subdir.
Use MyPrelude & fix a few linter warnings.

Change-Id: I19d5ba47be789fc24f8e02ee8721f73c706ae3e9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8465
Reviewed-by: Profpatsch <mail@profpatsch.de>
Autosubmit: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI

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

@@ -0,0 +1,32 @@
+{ depot, pkgs, ... }:
+
+# Parses https://packdeps.haskellers.com/reverse
+# and outputs the amount of reverse dependencies of each hackage package.
+
+let
+
+  rev = depot.nix.writeExecline "reverse-haskell-deps" { } [
+    "pipeline"
+    [
+      "${pkgs.curl}/bin/curl"
+      "-L"
+      "https://packdeps.haskellers.com/reverse"
+    ]
+    rev-hs
+
+  ];
+
+  rev-hs = pkgs.writers.writeHaskell "revers-haskell-deps-hs"
+    {
+      libraries = [
+        depot.users.Profpatsch.my-prelude
+        pkgs.haskellPackages.nicify-lib
+        pkgs.haskellPackages.tagsoup
+      ];
+
+    }
+    ./ReverseHaskellDeps.hs;
+
+
+in
+rev