Servers: Add route for creating channels.

Notifications: Subscribe to guild channels.

src/routes/channels/delete_channel.rs

@@ -108,6 +108,12 @@ pub async fn req(user: User, target: Ref) -> Result<()> {
 
             Ok(())
         }
-        Channel::TextChannel { .. } => unimplemented!()
+        Channel::TextChannel { .. } => {
+            if perm.get_manage_channel() {
+                target.delete().await
+            } else {
+                Err(Error::MissingPermission)
+            }
+        }
     }
 }