Allow authors to manage settings about gistlog

[mattstauffer]

@JacobBennett yah, "make private gists indexable" makes sense so someone could have Gistlog be their canonical instead of Gist.

[timacdonald]

Perhaps we could solve this issue also with the settings, ie, an index posts setting

[JacobBennett]

Good point, the option could be "make private gists indexable"? Which would remove the robots flag from the private gists that we have gistlogs for.

[timacdonald]

Yea, I don't know if that or just making them all public is the solution, but some discussion around it from users would be good :)
That, or going crazy and implementing a per post settings area at the top like Jekyll and have Gistlog parse the settings..might be a bit much though and outside this scope.

[mattstauffer]

I changed my mind after chatting with @timacdonald--I don't love a global "make private gists indexable" flag because I think it's unsafe and might make people think only their private gists which they've "added" to Gistlog are indexable. Problem is, there's no such concept. The moment you make your private gists indexable, they're ALL indexable. And I don't love security by obscuiryt.