[doom] Attempt config with symlink

I'm not 100% this works yet. But the idea here is to symlink from the
config directory into where we are locally storing the doom config. The
intention here is to enable `doom sync` to work without requiring a full
NixOS rebuild

home/modules/emacs/default.nix

@@ -42,6 +42,11 @@ in
       DOOMLOCALDIR = "${config.xdg.dataHome}/doom";
     };
 
-    home.file."${config.xdg.configHome}/doom".source = ./doom;
+    home.activation.doomConfig = lib.hm.dag.entryAfter ["writeBoundary"] ''
+      if [ ! -L "${config.xdg.configHome}/doom" ]; then
+        rm -rf "${config.xdg.configHome}/doom"
+        ln -sf "${./doom}" "${config.xdg.configHome}/doom"
+      fi
+    '';
   };
 }