fix(client): do not unmount default layout on navigate

client/gatsby-ssr.js

@@ -7,6 +7,7 @@ import headComponents from './src/head';
 import { createStore } from './src/redux/createStore';
 
 import GuideNavContextProvider from './src/contexts/GuideNavigationContext';
+import DefaultLayout from './src/components/layouts/Default';
 
 const store = createStore();
 
@@ -22,6 +23,26 @@ wrapRootElement.propTypes = {
   element: PropTypes.any
 };
 
+export const wrapPageElement = ({ element, props }) => {
+  const {
+    location: { pathname }
+  } = props;
+  if (pathname === '/') {
+    return (
+      <DefaultLayout disableSettings={true} landingPage={true}>
+        {element}
+      </DefaultLayout>
+    );
+  }
+  return <DefaultLayout>{element}</DefaultLayout>;
+};
+
+wrapPageElement.propTypes = {
+  element: PropTypes.any,
+  location: PropTypes.objectOf({ pathname: PropTypes.string }),
+  props: PropTypes.any
+};
+
 export const onRenderBody = ({ setHeadComponents, setPostBodyComponents }) => {
   setHeadComponents([...headComponents]);
   setPostBodyComponents(