Teach @mui/internal-markdown to import components from @mui/docs/...
Move ComponentLinkHeader to @mui/docs
@michaldudak consequence of this is that I had to default export ComponentLinkHeader. We could think about supporting named exports with something like:
@mui/docs/...
@mui/docs
ComponentLinkHeader
. We could think about supporting named exports with something like:but I feel like it would add unnecessary complexity in the markdown loader.