Move FEP under a new Standards category

I suggest we create a new Standards category on this forum and move Fediverse Enhancement Proposals under it. My reasoning stems from the FEP process’s stated goal: The goal of a FEP is to improve interoperability and well-being of diverse services, applications and communities that form the Fediverse. While the Fediverse and ActivityPub are often associated, it’s good to think of them independently if interoperability and well-being are primary. AP could be used outside of the Fediverse bu...