feat: display sensor values on dashboard page

src_data/pages/upgrade.html

@@ -11,12 +11,13 @@
     <header class="container">
       <nav>
         <ul>
-          <li><a href="/">
+          <li>
+            <a href="/">
               <div class="logo" data-i18n>logo</div>
-            </a></li>
+            </a>
+          </li>
         </ul>
         <ul>
-          <!--<li><a href="https://github.com/Laxilef/OTGateway/wiki" role="button" class="secondary" target="_blank">Help</a></li>-->
           <li>
             <select id="lang" aria-label="Lang">
               <option value="en" selected>EN</option>