CCIP-110 - Replace Guest Posts with Announcements

Guest Posts are one of the least popular Moon Burn engagement options that rCC offers and has some of the worst post use feedback from third parties with almost no party being happy with the results.

With that in mind this proposal is to remove Guest Posts as an engagement option and to replace it with a new "Announcement" option.

The announcement option is a new pinned post option that is live for 24 hours on CC, CCmoons, and Cryptomarkets. We would try to avoid booking while other entities are having announcements or Events on rCC to prevent overlap of pins. The cost in burned Moons is 50% of the event cost.

Essentially giving third parties an option to pin a post for one day at a higher cost compared to the three day option of hosting an event. This would be ideal for third parties just wanting to announce something on the sub without the need for further engagement or the time need of a 3 day pinned post.