Add a todo note

todo.txt

@@ -6,9 +6,9 @@ Annex practical:
 - Merge the two sub-practicals into one coherent practical.
 - Check the ``git annex drop'' part, it needs a sync first.
 
-All practicals:
+General:
 - Build on one example repository, to make everything more coherent.
-
-All presentations:
-- Have a last slide that summarizes all important commands (show it during
-  practical).
\ No newline at end of file
+- End all presentations with one slide that summarizes all important commands
+  (show it during practical).
+- If we have time, create (wiki) pages with the same content as the slides
+  (they can be more verbose), also useful outside the course.
\ No newline at end of file