index.html: re-add type=module on the script tag

login.js uses `import Session from 'https://esm.sh/solid-oidc'`
which requires the loading <script> tag to declare
type=module. I dropped this attribute when I briefly switched
to the xlogin <script src> approach and forgot to put it back
when I returned to a real module import. Browser raised
"Cannot use import statement outside a module" on load.

Author: melvincarvalho

index.html

@@ -86,6 +86,6 @@ <h1>Sign in to Solid</h1>
       <a href="https://github.com/JavaScriptSolidServer/JavaScriptSolidServer">JSS</a>
     </footer>
   </main>
-  <script src="./login.js"></script>
+  <script type="module" src="./login.js"></script>
 </body>
 </html>