Some massive changes to make flakiness better

Renamed the @inputs to @top. This was a misguided attempt to make a
different change, but it's going to stick, now.
Began moving packages to their own folder rather than being intermingled
with overlays
Created a local overlay that just includes my personal packages
Cleaned up some dead code
Moved to just using the raw 'imports' instead of needing to explicitly
call out the `foo = import foo.nix {};` syntax

overlays/default.nix

@@ -1,19 +1,20 @@
 final: prev:
 
 let
-  myPackages = pypackages: with pypackages; [
-    black
-    dateutil
-    ipython
-    mypy
-    pylint
-    pyyaml
-    responses
-    ruamel-yaml
-    tox
-    typing-extensions
-    virtualenv
-  ];
+  myPackages =
+    pypackages: with pypackages; [
+      black
+      dateutil
+      ipython
+      mypy
+      pylint
+      pyyaml
+      responses
+      ruamel-yaml
+      tox
+      typing-extensions
+      virtualenv
+    ];
 
   myPython = prev.python312.withPackages myPackages;
   is2405 = prev.lib.versionAtLeast prev.lib.version "24";
@@ -24,34 +25,34 @@ rec {
 
   ## Testing adding python packages in the correct manner
   pythonPackagesExtensions = (prev.pythonPackagesExtensions or [ ]) ++ [
-    (python-final: _:
-      let cp = python-final.callPackage; in {
+    (
+      python-final: _:
+      let
+        cp = python-final.callPackage;
+      in
+      {
         django-rapyd-modernauth = cp ./django-rapyd-modernauth.nix { };
         graypy = cp ./graypy.nix { };
         itg-django-utils = cp ./itg-django-utils.nix { };
         xonsh-apipenv = cp ./xonsh-apipenv.nix { };
-      })
+      }
+    )
   ];
 
   # My own packages
   aacs = prev.callPackage ./aacs.nix { };
   create_ssl = prev.callPackage ./create_ssl.nix { };
   enwiki-dump = prev.callPackage ./enwiki-dump.nix { };
-  hms = prev.callPackage ./hms {
-    pkgs = final.pkgs;
-  };
   inject = prev.callPackage ./inject.nix { inherit (final) pkgs; };
   inject-darwin = prev.callPackage ./inject-darwin.nix { inherit (final) pkgs; };
-  setup-ssh = prev.callPackage ./setup-ssh {
-    pkgs = final.pkgs;
-  };
+  setup-ssh = prev.callPackage ./setup-ssh { pkgs = final.pkgs; };
   upgrade-pg-cluster = prev.callPackage ./upgrade-pg-cluster.nix { };
 
   # Overrides of packages
   brew = prev.callPackage ./homebrew.nix { };
-  copier = (if is2405 then
-    prev.copier.overridePythonAttrs
-      (_: {
+  copier = (
+    if is2405 then
+      prev.copier.overridePythonAttrs (_: {
         version = "9.1.0";
         src = final.fetchFromGitHub {
           owner = "copier-org";
@@ -60,15 +61,16 @@ rec {
           hash = "sha256-x5r7Xv4lAOMkR+UIEeSY7LvbYMLpTWYuICYe9ygz1tA=";
           postFetch = "rm $out/tests/demo/doc/ma*ana.txt";
         };
-      }) else prev.copier);
+      })
+    else
+      prev.copier
+  );
   libbluray-custom = prev.libbluray.override {
     withAACS = true;
     withBDplus = true;
   };
   template = prev.callPackage ./template.nix { };
-  handbrake = prev.handbrake.override {
-    libbluray = libbluray-custom;
-  };
+  handbrake = prev.handbrake.override { libbluray = libbluray-custom; };
   libvirt-greg = prev.libvirt.overrideAttrs {
     postInstall = prev.libvirt.postInstall + "rm -r $out/lib/systemd/system/libvirtd.service";
   };