refactor: clean up quickshell devShell

devShells/quickshell/default.nix

@@ -0,0 +1,24 @@
+{
+  lib,
+  mkShell,
+  kdePackages,
+  quickshell,
+  ...
+}:
+mkShell {
+  packages = [
+    quickshell
+  ];
+
+  shellHook = ''
+    export QML2_IMPORT_PATH="$QML2_IMPORT_PATH:${lib.makeSearchPath "lib/qt-6/qml" [
+      quickshell
+      kdePackages.qtdeclarative
+    ]}"
+  '';
+
+  meta.description = ''
+    Shell that provides the quickshell executable with `QML2_IMPORT_PATH`
+    correctly defined for quickshell development.
+  '';
+}