Reinstate NIP-88: Polls on Nostr

[abh3po]

Since the drama that caused NIP 88 to be removed: https://github.com/nostr-protocol/nips/pull/1501

There have been two major updates:

• https://getwired.app has also integrated this NIP

• https://pollerama.fun has added expiring polls, which no longer makes this feature hypothetical.

I have made very slight changes according to some of the concerns raised in the comment thread.

@fiatjaf @vitorpamplona @staab @smolgrrr @alexgleason