remapped pgex to new location (#100)

* remapped pgex to new location

* fixed typo

* set remap to examples folder in repo

Author: oddbookworm

_includes/footer.html

@@ -37,7 +37,7 @@ <h3>Other Useful Links</h3>
     </div>
 
     <div>
-        <h4><a class="new-tab" href="https://github.com/Matiiss/pygame_examples">Pygame Examples</a></h4>
+        <h4><a class="new-tab" href="https://github.com/pygame-examples/pygame_examples/tree/main/pgex/examples">Pygame Examples</a></h4>
         <h4>Want to contribute to this guide or did you find a problem? Visit us <a class="new-tab" href="https://github.com/pygame-guide-for-sneks/pygame-guide-for-sneks.github.io">here!</a></h4>
     </div>
 </div>