[web] Switch to semantic html for hiding the create link form

Signed-off-by: Ben Aaron Goldberg <ben@benaaron.dev>

web/templates/index.html

@@ -53,9 +53,8 @@
 
     <hr/>
 
-    <label for="form-toggle">Create your own custom link!</label>
-    <input type="checkbox" id="form-toggle" style="display: none;"/>
-    <div id="form">
+    <details id="create-link">
+      <summary>Create your own custom pronouns link!</summary>
       <form action="/" method="post">
         <label for="name">Name</label>
         <input type="text" id="name" name="name"/><br/>
@@ -65,6 +64,6 @@
         {% endfor %}
         <input type="submit" value="Create!">
       </form>
-    </div>
+    </details>
  </body>
 </html>