[Discussion] add an optional expiration for articles

[thrownness]

Using https://gun.eco/docs/Forget

Instead of posting this: gun.get('readthis.space#').get(articleHash).put(authorPubKey)

We post this: gun.get('readthis.space#<?86400').get(articleHash).put(authorPubKey)

And the article index then gets removed. Article still lives on user namespace, but the link will no longer work.

[thrownness]

Is this needed now that Authors can easily just delete their articles? This expiration feature would merely have the improvement of eventually pruning the index so it doesn't become absurdly massive.