add pages and menu to web frontend

firmware/fsdata/fs/index.html

@@ -12,6 +12,11 @@
         <span>fiatlux v0.2</span>
         <span class="label warning" id="status_box">Loading...</span>
     </a>
+    <input id="bmenub" type="checkbox" class="show">
+    <label for="bmenub" class="burger pseudo button">&#9776;</label>
+    <div class="menu">
+        <a href="/" class="button icon-picture" onclick="use_page('dashboard'); return false">Dashboard</a>
+    </div>
 </nav>
 <main data-page="dashboard" id="page">
     <section id="dashboard">
@@ -128,6 +133,7 @@
 <div id="unused_values" style="display:none;"></div>
 <script type="text/javascript" src="js/smoothie_min.js"></script>
 <script>
+    var section = document.getElementById("page");
     var menu = document.getElementById("bmenub");
     var voltage = document.getElementById("out_voltage");
 
@@ -146,6 +152,10 @@
         return pos;
     };
 
+    function use_page(name) {
+        section.dataset.page = name;
+    }
+
     var ws;
     var retries;
     var series = new TimeSeries();