started to look into this so I could use dendron to review/revise the Leo documentation. Problem anticpated: * yaml frontmatter get pass to Sphinx can 'comment out' such line by prefixing each line with ".. " or do something like this:

.. frontmatter-(yaml for Dendron)
   ---
   id: a7c3a810-28c8-4b47-96a6-8156b1524af4
   title: Lookup
   desc: ''
   updated: 1595952505038
   created: 1595952505038
   ---