message: add note about cleaning up directories
diff: @@ -188,6 +188,10 @@ other Axom developers to use during development, in Axom Gitlab CI testing, etc.
  ``host-configs`` subdirectory and commit them to your branch. Make sure all
  file changes from all previous steps are also committed and pushed upstream.
  + .. note:: If this step fails, delete the time date stamped directory that was created.
  + If you forget to do this, it will eventually be deleted by hand in bulk when
  + they are past a certain age and no longer needed.
  +
  #. **Build new Docker images.**
  We utilize Docker images that have pre-built TPLs in our Github CI checks.
  To build these, go to our
  