niri: remove flake input, keyboard scripts

flake.lock

@@ -1,26 +1,5 @@
 {
   "nodes": {
-    "niri": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ],
-        "rust-overlay": "rust-overlay"
-      },
-      "locked": {
-        "lastModified": 1773130184,
-        "narHash": "sha256-3bwx4WqCB06yfQIGB+OgIckOkEDyKxiTD5pOo4Xz2rI=",
-        "owner": "niri-wm",
-        "repo": "niri",
-        "rev": "b07bde3ee82dd73115e6b949e4f3f63695da35ea",
-        "type": "github"
-      },
-      "original": {
-        "owner": "niri-wm",
-        "repo": "niri",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1770134715,
@@ -38,33 +17,11 @@
     },
     "root": {
       "inputs": {
-        "niri": "niri",
         "nixpkgs": "nixpkgs",
         "treefmt-nix": "treefmt-nix",
         "wrappers": "wrappers"
       }
     },
-    "rust-overlay": {
-      "inputs": {
-        "nixpkgs": [
-          "niri",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1757989933,
-        "narHash": "sha256-9cpKYWWPCFhgwQTww8S94rTXgg8Q8ydFv9fXM6I8xQM=",
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "rev": "8249aa3442fb9b45e615a35f39eca2fe5510d7c3",
-        "type": "github"
-      },
-      "original": {
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "type": "github"
-      }
-    },
     "treefmt-nix": {
       "inputs": {
         "nixpkgs": [