feat!(flake): update homix

Add more & generalize flake outputs:
    - templates: just a `default.nix` (TODO: add a `Haskell` template)
    - packages & devShells: create and use `forEachPkgs`
Add more `Wayland` things for `homix`:
    - `swww` - custom package + custom systemd service (TODO: abstract away)
    - `wired` - from flake + `home-manager` module
Add default `imports` and `nixokgs.overlays` for `reo101@homix`
    -- TODO: don't handwire it, somehow *auto-import* from `mkNixosHost` in `flake.nix`

pkgs/swww/default.nix

@@ -0,0 +1,32 @@
+{ lib, fetchFromGitHub, rustPlatform, pkg-config, libxkbcommon }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "swww";
+  version = "v0.7.1";
+
+  src = fetchFromGitHub {
+    owner = "Horus645";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-Z90Zwjqcu0hbtJwKPUNV996mtdgX//ZWWm+Dya/JV9A=";
+  };
+
+  cargoSha256 = "sha256-f6++5DazCqJjRuZquiJ5hdf9l+q6sOBZOL/vyQy1hA0";
+
+  nativeBuildInputs = [
+    pkg-config
+  ];
+
+  buildInputs = [
+    libxkbcommon
+  ];
+
+  doCheck = false;
+
+  meta = with lib; {
+    description = "A Solution to your Wayland Wallpaper Woes";
+    homepage = "https://github.com/Horus645/swww";
+    license = licenses.gpl3;
+    maintainers = [ maintainers.reo101 ];
+  };
+}