Use icons with highest resolution available for website

Adjusts the website to use the 150x150 version of the JDO logo instead
of smaller ones. Sets the scaling manually to keep the previous size
when using the larger image.

Adjusts the image size of the header icon to better fit the bar and
create an even spacing with the default layout.
diff --git a/src/main/asciidoc/index.adoc b/src/main/asciidoc/index.adoc
index 36f191d..ddc98a0 100644
--- a/src/main/asciidoc/index.adoc
+++ b/src/main/asciidoc/index.adoc
@@ -5,7 +5,7 @@
 :grid: cols
 
 [[index]]
-image:images/JDOx100.png[float="left"]
+image:images/JDOx150.png[logo,100,100,float="left"]
 image:images/jdo_text.png[float="right"]
 
 '''''
diff --git a/src/main/template/document.html.erb b/src/main/template/document.html.erb
index 6a01fd2..7accbd5 100644
--- a/src/main/template/document.html.erb
+++ b/src/main/template/document.html.erb
@@ -13,7 +13,7 @@
 
     <title><%= doctitle(:sanitize => true) || (attr 'untitled-label') %></title>
 
-    <link rel="icon" type="image/png" href="<%= (attr :_basedir) %>images/JDO_32x32.png"/>
+    <link rel="icon" type="image/png" href="<%= (attr :_basedir) %>images/JDOx150.png"/>
 
     <!--
         Apache JDO Documentation Template
@@ -108,7 +108,7 @@
             </button>
             <!-- 'style' added to align image with navbar. FIX THIS -->
             <a class="navbar-brand" href="https://db.apache.org/jdo/">
-                <img style="margin-top: -12px;" alt="Brand" src="<%= (attr :_basedir) %>images/JDO_44x44.png"/>
+                <img style="margin-top: -12px;" alt="Brand" width="45.5" height="45.5" src="<%= (attr :_basedir) %>images/JDOx150.png"/>
             </a>
             <!-- TODO Any way to abstract the version from Maven? -->
             <a class="navbar-brand" href="<%= (attr :_basedir) %>index.html">Apache JDO</a>