title should be a header for SEO

htdocs/include/header.include.html

@@ -3,7 +3,7 @@
         <a href="https://www.openwebrx.de/" target="_blank"><img src="${assets_prefix}static/gfx/openwebrx-top-logo.png" class="webrx-top-logo" alt="OpenWebRX Logo"/></a>
         <img class="webrx-rx-avatar openwebrx-photo-trigger" src="${assets_prefix}static/gfx/openwebrx-avatar.png" alt="Receiver avatar"/>
         <div class="webrx-rx-texts openwebrx-photo-trigger">
-            <div class="webrx-rx-title">${receiver_name}</div>
+            <h1 class="webrx-rx-title">${receiver_name}</h1>
             <div class="webrx-rx-desc">${receiver_location} | Loc: ${locator}, ASL: ${receiver_asl} m</div>
         </div>
         <section class="openwebrx-main-buttons">