Add some missing code from previous commit

Signed-off-by: William Casarin <jb55@jb55.com>

damus/Nostr/Nostr.swift

@@ -13,6 +13,21 @@ struct Profile: Decodable {
     let display_name: String?
     let about: String?
     let picture: String?
+    let website: String?
+    let lud06: String?
+    let lud16: String?
+    
+    var lightning_uri: URL? {
+        if let url = (self.lud06.flatMap { URL(string: "lightning:" + $0) }) {
+            return url
+        }
+        
+        if let url = (self.lud16.flatMap { URL(string: "lightning:" + $0) }) {
+            return url
+        }
+        
+        return nil
+    }
     
     static func displayName(profile: Profile?, pubkey: String) -> String {
         return profile?.name ?? abbrev_pubkey(pubkey)