steveej-x13s-rmvbl: init with minimal setup

this configures a standalone USB device that doesn't need configuration
of the firmware's EFI variables.

flake.lock

@@ -293,22 +293,6 @@
         "type": "github"
       }
     },
-    "magmawm": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1703542178,
-        "narHash": "sha256-HuCAz+B+cg7HoEEL67heaYRc8zmQCnPBR+DgmuiIZBk=",
-        "owner": "MagmaWM",
-        "repo": "MagmaWM",
-        "rev": "24dc21f228efb034cd0237fb5ff9a8310f1929b7",
-        "type": "github"
-      },
-      "original": {
-        "owner": "MagmaWM",
-        "repo": "MagmaWM",
-        "type": "github"
-      }
-    },
     "nix-eval-jobs": {
       "inputs": {
         "flake-parts": "flake-parts_3",
@@ -663,7 +647,6 @@
         "flake-parts": "flake-parts",
         "get-flake": "get-flake",
         "jay": "jay",
-        "magmawm": "magmawm",
         "nixos-anywhere": "nixos-anywhere",
         "nixpkgs": [
           "nixpkgs-2311"