Refactor NIP-XX Document and Protocol Implementation for Directory Consensus

- Updated the NIP-XX document to clarify terminology, replacing "attestations" with "acts" for consistency.
- Enhanced the protocol by introducing new event kinds: Trust Act (Kind 39101) and Group Tag Act (Kind 39102), with detailed specifications for their structure and usage.
- Modified the signature generation process to include the canonical WebSocket URL, ensuring proper binding and verification.
- Improved validation mechanisms for identity tags and event replication requests, reinforcing security and integrity within the directory consensus protocol.
- Added comprehensive documentation for new event types and their respective validation processes, ensuring clarity for developers and users.
- Introduced new helper functions and structures to facilitate the creation and management of directory events and acts.

app/server.go

@@ -166,7 +166,7 @@ func (s *Server) WebSocketURL(req *http.Request) (url string) {
 	if host == "" {
 		host = req.Host
 	}
-	return proto + "://" + host
+	return proto + "://" + strings.TrimRight(host, "/") + "/"
 }
 
 func (s *Server) DashboardURL(req *http.Request) (url string) {