Two new rules; are there more on the way?

[chris-c-thomas]

Opening as a ticket since discussions are not enabled for this repo.

The only two rules this adds is GH001 No default alt text & GH002 No generic link text right? While all the rules from markdownlint are inherited?

Will this get more opinionated? I usually like to stick to @github's way of doing things on the platform. I know I can add my own of course.