Major refactor to flake, abstract non-trivial packages into their own

files (such as firefox/spotify-qt+librespot), create utils for reusable
function library

nix/utils.nix

@@ -0,0 +1,16 @@
+{
+  mk_symlinks =
+    {
+      config,
+      basePath ? "${config.home.homeDirectory}/dev/git/.dotfiles",
+      dotfiles ? [ ],
+    }:
+    builtins.listToAttrs (
+      map (file: {
+        name = builtins.elemAt file 0;
+        value = {
+          source = config.lib.file.mkOutOfStoreSymlink "${basePath}/${builtins.elemAt file 1}";
+        };
+      }) dotfiles
+    );
+}