Moved to static that should have been done at first

src/intro.cpp

@@ -1,6 +1,6 @@
 #include "include/intro.h"
 
 void Intro::mainIntro(){
-  cout << "The world didn't end with a bang. It ended with a groan.. and the scratching of death fingers against steel shutters." << endl;
-  std::this_thread::sleep_for(std::chrono::milliseconds(3000));
+  Print::blank_line();
+  Print::type("The world didn't end with a bang. It ended with a groan.. and the scratching of death fingers against steel shutters.");
 }