Div's are difficult to translate into org syntax, as there are multiple
div-like structures (drawers, special blocks, greater blocks) which all
have their advantages and disadvantages. Previously pandoc would
use raw HTML to preserve the full div information; this was rarely
useful and resulted in visual clutter. Div-rendering was changed to
discard the div's classes and key-value pairs if there is no natural way
to translate the div into an org structure.
Closes: #3771
