fix: use proper html tag

pages/webring.html

@@ -17,11 +17,11 @@
     <button id="theme-switcher"></button>
     <a class="account" href="/pages/account.html">Nalog</a>
   </header>
-  <div id="main">
+  <main>
     <list>
     <li> <a href="https://tilde.zone/explore">Tilde Zone</a> </li>
     </list>
-  </div>
+  </main>
   <footer>
     <div id="sections-menu">
       <a href="/pages/events.html">Događaji</a>