Add org-brain to emacs init

emacs/.config/doom/init.el

@@ -123,6 +123,7 @@
        ;;nix               ; I hereby declare "nix geht mehr!"
        ;;ocaml             ; an objective camel
        (org                ; organize your plain life in plain text
+        +brain             ; an org brain?
         +dragndrop         ; file drag & drop support
         +hugo
         +gnuplot