restructured directories + modularized btrfs mount

bundles/dev/nix.nix

@@ -0,0 +1,10 @@
+{ config, pkgs, ... }:
+
+{
+  users.users.jawz.packages = with pkgs; ([
+    expect # keep color when nom'ing
+    nix-output-monitor # autistic nix builds
+    nixfmt # linting
+    cachix # why spend time compiling?
+  ]);
+}