Fix Dashboard UI styling issues

Summary:
- Add Icons for tserver pages
- Fix the footer position issue

Test Plan: Went to the UI page and validated

Reviewers: sid, karthik

Reviewed By: karthik

Subscribers: bogdan, ybase, bharat

Differential Revision: https://phabricator.dev.yugabyte.com/D3462

src/yb/master/master-path-handlers.cc

@@ -433,7 +433,7 @@ void MasterPathHandlers::RootHandler(const Webserver::WebRequest& req,
   (*output) << "<div class='row dashboard-content'>\n";
 
   (*output) << "<div class='col-xs-12 col-md-8 col-lg-6'>\n";
-  (*output) << "<div class='panel panel-default'>\n"
+  (*output) << "<div class='panel panel-primary'>\n"
             << "<div class='panel-heading'><h2 class='panel-title'> Overview</h2></div>\n";
   (*output) << "<div class='panel-body'>";
   (*output) << "<table class='table'>\n";
@@ -513,7 +513,7 @@ void MasterPathHandlers::HandleMasters(const Webserver::WebRequest& req,
     *output << "<h1>" << s.ToString() << "</h1>\n";
     return;
   }
-  (*output) << "<div class='panel panel-default'>\n"
+  (*output) << "<div class='panel panel-primary'>\n"
             << "<div class='panel-heading'><h2 class='panel-title'>Masters</h2></div>\n";
   (*output) << "<div class='panel-body'>";
   (*output) << "<table class='table'>\n";
@@ -752,7 +752,7 @@ Status MasterPathHandlers::Register(Webserver* server) {
   // The set of handlers visible on the nav bar.
   server->RegisterPathHandler(
     "/", "Home", std::bind(&MasterPathHandlers::RootHandler, this, _1, _2), is_styled,
-    is_on_nav_bar, "fa fa-home");
+    false);
   Webserver::PathHandlerCallback cb =
       std::bind(&MasterPathHandlers::HandleTabletServers, this, _1, _2);
   server->RegisterPathHandler(

src/yb/server/webserver.cc

@@ -224,7 +224,7 @@ Status Webserver::Start() {
   PathHandlerCallback default_callback =
       std::bind(boost::mem_fn(&Webserver::RootHandler), this, _1, _2);
 
-  RegisterPathHandler("/", "Home", default_callback);
+  RegisterPathHandler("/", "Home", default_callback, true, false);
 
   std::vector<Endpoint> addrs;
   RETURN_NOT_OK(GetBoundAddresses(&addrs));

src/yb/tserver/tserver-path-handlers.cc

@@ -87,7 +87,7 @@ Status TabletServerPathHandlers::Register(Webserver* server) {
       true /* styled */, false /* is_on_nav_bar */);
   server->RegisterPathHandler(
       "/tablets", "Tablets", std::bind(&TabletServerPathHandlers::HandleTabletsPage, this, _1, _2),
-      true /* styled */, true /* is_on_nav_bar */);
+      true /* styled */, true /* is_on_nav_bar */, "fa fa-server");
   server->RegisterPathHandler(
       "/tablet", "", std::bind(&TabletServerPathHandlers::HandleTabletPage, this, _1, _2),
       true /* styled */, false /* is_on_nav_bar */);
@@ -107,9 +107,9 @@ Status TabletServerPathHandlers::Register(Webserver* server) {
       "/log-anchors", "", std::bind(&TabletServerPathHandlers::HandleLogAnchorsPage, this, _1, _2),
       true /* styled */, false /* is_on_nav_bar */);
   server->RegisterPathHandler(
-      "/dashboards", "Dashboards",
+      "/", "Dashboards",
       std::bind(&TabletServerPathHandlers::HandleDashboardsPage, this, _1, _2), true /* styled */,
-      true /* is_on_nav_bar */);
+      false /* is_on_nav_bar */);
   server->RegisterPathHandler(
       "/maintenance-manager", "",
       std::bind(&TabletServerPathHandlers::HandleMaintenanceManagerPage, this, _1, _2),

www/yb.css

@@ -116,6 +116,10 @@ body {
   /* Set the fixed height of the footer here */
   height: 60px;
   background-color: #f5f5f5;
+  /* Pin the footer to the bottom */
+  position: absolute;
+  bottom: 0;
+  margin-left: -35px;
 }
 .footer pre {
   border: none;
@@ -139,6 +143,7 @@ body {
 
 .dashboard-content {
   margin-top: 25px;
+  margin-bottom: 60px;
 }
 
 .table > tbody > tr:first-child > td {