use plymouth for boot screen

nixos/flake.lock

@@ -1,39 +1,6 @@
 {
   "nodes": {
-    "home-manager": {
-      "inputs": {
-        "nixpkgs": "nixpkgs"
-      },
-      "locked": {
-        "lastModified": 1773093840,
-        "narHash": "sha256-u/96NoAyN8BSRuM3ZimGf7vyYgXa3pLx4MYWjokuoH4=",
-        "owner": "nix-community",
-        "repo": "home-manager",
-        "rev": "bb014746edb2a98d975abde4dd40fa240de4cf86",
-        "type": "github"
-      },
-      "original": {
-        "id": "home-manager",
-        "type": "indirect"
-      }
-    },
     "nixpkgs": {
-      "locked": {
-        "lastModified": 1772773019,
-        "narHash": "sha256-E1bxHxNKfDoQUuvriG71+f+s/NT0qWkImXsYZNFFfCs=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "aca4d95fce4914b3892661bcb80b8087293536c6",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
       "locked": {
         "lastModified": 1772963539,
         "narHash": "sha256-9jVDGZnvCckTGdYT53d/EfznygLskyLQXYwJLKMPsZs=",
@@ -51,8 +18,7 @@
     },
     "root": {
       "inputs": {
-        "home-manager": "home-manager",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs"
       }
     }
   },