DocTypeFacade for basic markdown syntax
https://www.markdownguide.org/basic-syntax/
NOTES:
tables are rendered in html, as they are not included in basic syntax
currently some DocBase model elements are skipped (for exampled DocImage)
DocTypeFacade for extended markdown syntax
https://www.markdownguide.org/extended-syntax/
NOTE: all elements, including tables, are rendered in markdown format