Added /duck command to perform searches using duckduckgo chat bot

src/profanity.c

@@ -140,6 +140,13 @@ prof_handle_delayed_message(char *from, char *message, GTimeVal tv_stamp,
     }
 }
 
+void
+prof_handle_duck_result(const char * const result)
+{
+    ui_duck_result(result);
+    ui_current_page_off();
+}
+
 void
 prof_handle_error_message(const char *from, const char *err_msg)
 {