Add Rmarkdown as Export/Text flavour

Some users would like to combine Logseq’s excellent Zotero integration with other markdown based workflows. One major flavour of markdown in the scientific community is Rmarkdown from RStudio.

Logseq citations [[@key]] need to be converted to their single-square bracket equivalent [@key] before going into Rmarkdown. It would be nice if this relatively simple task could be added to a new setting within the existing Export > Text menu.

Extends this earlier request: Add "Markdown" to "Copy As" options