Added a stylesheet for the cursor to become a pointer when hovering over the headers

src/main/webapp/css/pokemonTypes.css

+.clickable-header {
+    cursor: pointer;
+}

src/main/webapp/pokemonTypes.html

@@ -8,6 +8,7 @@
     <!-- Bootstrap CSS -->
     <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css"
           integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
+    <link rel="stylesheet" href="css/pokemonTypes.css">
 
     <title>Title</title>
     <link rel="icon" type="image/x-icon" href="/pokemon/favicon.ico">
@@ -41,4 +42,4 @@
     </div>
 
 </body>
-</html>
\ No newline at end of file
+</html>