Parsoid is used by Flow and VisualEditor to convert Wikitext->HTML and DOM5. It is a requirement for these extensions to be enabled on Miraheze (for performance reasons) and as such is a necessary piece of software.
As a result of the implications of the software yet also the lack of knowledge of the software currently in the team, this page won't contain any information. Southparkfan will look into Parsoid's advanced configuration soon. Southparkfan is happy to help you with all queries regarding Parsoid in production.