feat: reintroduce ping command

Signed-off-by: seth <getchoo@tuta.io>

src/commands/mod.rs

@@ -10,6 +10,7 @@ pub fn to_global_commands() -> Vec<Command<Data, Report>> {
     vec![
         general::joke(),
         general::members(),
+        general::ping(),
         general::rory(),
         general::say(),
         general::stars(),