emacs: add ledger package and remove rgb module

programs/emacs/default.nix

@@ -17,6 +17,7 @@
       ]
     )) # for flyspell
     languagetool # for grammar
+    ledger # for accounting and org-ledger
   ];
 
   # Neatly place the configuration files for doom in their right place.

programs/emacs/doom/init.el

@@ -104,7 +104,6 @@
        ;;pass              ; password manager for nerds
        ;;pdf               ; pdf enhancements
        ;;prodigy           ; FIXME managing external services & code builders
-       rgb               ; creating color strings
        ;;taskrunner        ; taskrunner for all your projects
        ;;terraform         ; infrastructure as code
        ;;tmux              ; an API for interacting with tmux