[Multi-Spec] Load markdown pages

[bourdakos1]

[danieleds]

@bourdakos1 I'd love to implement this, do you have any suggestion? Did you have any preference on where the markdown files should live, and where/how they should be displayed?

[bourdakos1]

We had a bit of a conversation about all of this here: #82

You can draft up an rfc if you want to get feedback on your approach before opening a PR

[danieleds]

@bourdakos1 I was trying to take a look at this but it seems to me that we'd have to duplicate a lot of logic from docusaurus-plugin-content-docs. Do you think there is a way of importing that functionality, or making the two plugins "talk"?