remove external impermanence library

flake.lock

@@ -36,21 +36,6 @@
         "type": "github"
       }
     },
-    "impermanence": {
-      "locked": {
-        "lastModified": 1668668915,
-        "narHash": "sha256-QjY4ZZbs9shwO4LaLpvlU2bO9J1juYhO9NtV3nrbnYQ=",
-        "owner": "nix-community",
-        "repo": "impermanence",
-        "rev": "5df9108b346f8a42021bf99e50de89c9caa251c3",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "impermanence",
-        "type": "github"
-      }
-    },
     "mobile-nixos": {
       "flake": false,
       "locked": {
@@ -116,7 +101,6 @@
     "root": {
       "inputs": {
         "home-manager": "home-manager",
-        "impermanence": "impermanence",
         "mobile-nixos": "mobile-nixos",
         "nixpkgs": "nixpkgs",
         "nixpkgs-stable": "nixpkgs-stable",

flake.nix

@@ -18,7 +18,6 @@
       url = "github:Mic92/sops-nix";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    impermanence.url = "github:nix-community/impermanence";
     uninsane = {
       url = "git+https://git.uninsane.org/colin/uninsane";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -32,7 +31,6 @@
     mobile-nixos,
     home-manager,
     sops-nix,
-    impermanence,
     uninsane
   }: let
     patchedPkgs = system: nixpkgs.legacyPackages.${system}.applyPatches {
@@ -58,7 +56,6 @@
         ./modules
         (import ./hosts/instantiate.nix name)
         home-manager.nixosModule
-        impermanence.nixosModule
         sops-nix.nixosModules.sops
         {
           nixpkgs.overlays = [