We've been having it since quite a few years, it's called export and it looks like this:

- original org: https://demo.filestash.app/api/export/hnorg/text/org/emacs.o...

- markdown: https://demo.filestash.app/api/export/hnorg/text/markdown/em...

- html: https://demo.filestash.app/api/export/hnorg/text/html/emacs....

- pdf: https://demo.filestash.app/api/export/hnorg/application/pdf/...

- more fancy plain text: https://demo.filestash.app/api/export/hnorg/text/plain/emacs...

there's more builtin and with plugin you can say extend the github markdown to cope with jekyll, hugo, ...etc