Added ISRs for exceptions (taken from old-kern)

src/kernel/main.c

@@ -1,11 +1,12 @@
 #include "screen.h"
 #include "idt.h"
+#include "isrs.h"
 
 void main() {
     setupIdt();
+    setupIsrs();
     clear(0x0f);
 
     print("kern.\n\n", 0x0f);
-    print("> ", 0x0e);
 }