diff --git a/gitbook/gitbook-plugin-github/plugin.js b/gitbook/gitbook-plugin-github/plugin.js
index 14810ce0b..e69de29bb 100644
--- a/gitbook/gitbook-plugin-github/plugin.js
+++ b/gitbook/gitbook-plugin-github/plugin.js
@@ -1,14 +0,0 @@
-require([ 'gitbook' ], function (gitbook) {
-    gitbook.events.bind('start', function (e, config) {
-        var githubURL = config.github.url;
-
-        gitbook.toolbar.createButton({
-            icon: 'fa fa-github',
-            label: 'GitHub',
-            position: 'right',
-            onClick: function() {
-                window.open(githubURL)
-            }
-        });
-    });
-});
diff --git a/gitbook/images/envoy-arch.png b/gitbook/images/envoy-arch.png
new file mode 100644
index 000000000..a1dd849f1
Binary files /dev/null and b/gitbook/images/envoy-arch.png differ
diff --git a/gitbook/images/istio-arch.jpg b/gitbook/images/istio-arch.jpg
index c5441aa6d..9b1b72b36 100644
Binary files a/gitbook/images/istio-arch.jpg and b/gitbook/images/istio-arch.jpg differ