新增大屏网页版本

web/bigscreen_base.html

@@ -9,7 +9,7 @@
         and Qt device independent pixels. -->
     <meta name="viewport" content="width=device-width, height=device-height, user-scalable=0"/>
 
-    <title>bigscreen_base</title>
+    <title>可视化大屏电子看板系统</title>
     <style>
       /* Make the html body cover the entire (visual) viewport with no scroll bars. */
       html, body { padding: 0; margin: 0; overflow:hidden; height: 100vh }