Remove pi-imagegen extension

flake.lock

@@ -257,22 +257,6 @@
         "type": "github"
       }
     },
-    "pi-imagegen": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1783257937,
-        "narHash": "sha256-s85J73xCUOUh7LfzEF0a11He/PX6h9FG0ZSJyMQs128=",
-        "owner": "Jon-Vii",
-        "repo": "pi-imagegen",
-        "rev": "2ca63486547fdf780e84b105548783bc9de1e5c3",
-        "type": "github"
-      },
-      "original": {
-        "owner": "Jon-Vii",
-        "repo": "pi-imagegen",
-        "type": "github"
-      }
-    },
     "pyproject-build-systems": {
       "inputs": {
         "nixpkgs": [
@@ -332,7 +316,6 @@
         "home-manager": "home-manager",
         "nixpkgs": "nixpkgs_2",
         "pi": "pi",
-        "pi-imagegen": "pi-imagegen",
         "sops-nix": "sops-nix"
       }
     },