Update PTG logo

Use official PTG logo rather than the summit arrows logo.

Change-Id: Ie837d2eaa890556722a43800fb9bca55974b3039

html/etherpads.html

@@ -11,7 +11,7 @@
 <div class="container">
 <nav class="navbar navbar-default">
   <div class="container-fluid">
-    <div class="navbar-header navbar-brand"><img src="/logo.png"></div>
+    <div class="navbar-header navbar-brand"><img src="/logo.png" height="22"></div>
     <div class="navbar-header navbar-brand">Project Teams Gathering</div>
     <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
       <ul class="nav navbar-nav">

html/index.html

@@ -11,7 +11,7 @@
 <div class="container">
 <nav class="navbar navbar-default">
   <div class="container-fluid">
-    <div class="navbar-header navbar-brand"><img src="/logo.png"></div>
+    <div class="navbar-header navbar-brand"><img src="/logo.png" height="22"></div>
     <div class="navbar-header navbar-brand">Project Teams Gathering</div>
     <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
       <ul class="nav navbar-nav">

html/ptg.html

@@ -11,7 +11,7 @@
 <div class="container">
 <nav class="navbar navbar-default">
   <div class="container-fluid">
-    <div class="navbar-header navbar-brand"><img src="/logo.png"></div>
+    <div class="navbar-header navbar-brand"><img src="/logo.png" height="22"></div>
     <div class="navbar-header navbar-brand">Project Teams Gathering</div>
     <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
       <ul class="nav navbar-nav">