Docs on #post context don't mention visibility attribute

Issue Summary
The documentation of the Post object at Post Context: Ghost Themes - Documentation doesn’t include the visibility attribute.

I actually didn’t think think visibility was accessible until I found these forum topics via search:

You can see from these topics that there is confusion among theme authors about the exact values this attribute can have.


Members related documentation is in the members docs with a section that covers access and content visibility

We can definitely look at adding a link to that from the post context section though. Thanks for raising it.

Ah, thanks for the pointer.

I think it would be a great idea to link to the content visibility page from the Post Context one.