.. foldable table of content can be implemented by making sure that the headers
   follow proper hierarchy  - see http://documentation-style-guide-sphinx.readthedocs.io/en/latest/style-guide.html
    and making sure that the document that is at the "top of" of toc has subdocs listed as in this example

Common CC3D Tasks
=================


.. toctree::
    :maxdepth: 1

    modifying_attributes_of_cellg_object
    steppable_frequency
    resizing_the_lattice
    recording_screenshots
    building_a_wall