Added navigation buttons for training modules 1 to 4

Author: Philipsty

content/en/docs/tutorials/kubernetes-basics/create-cluster/cluster-interactive.html

@@ -25,6 +25,7 @@
         </div>
         <div class="row">
             <div class="col-md-12">
+            	<a class="btn btn-lg btn-success" href="/docs/tutorials/kubernetes-basics/" role="button">Home<span class="btn__next">›</span></a>
                 <a class="btn btn-lg btn-success" href="/docs/tutorials/kubernetes-basics/deploy-app/deploy-intro/" role="button">Continue to Module 2<span class="btn__next">›</span></a>
             </div>
         </div>

content/en/docs/tutorials/kubernetes-basics/deploy-app/deploy-interactive.html

@@ -37,6 +37,8 @@
         </div>
         <div class="row">
             <div class="col-md-12">
+            	<a class="btn btn-lg btn-success" href="/docs/tutorials/kubernetes-basics/create-cluster/cluster-intro/" role="button">Return to Module 1<span class="btn__next">›</span></a>
+            	<a class="btn btn-lg btn-success" href="/docs/tutorials/kubernetes-basics/" role="button">Home<span class="btn__next">›</span></a>
                 <a class="btn btn-lg btn-success" href="/docs/tutorials/kubernetes-basics/explore/explore-intro/" role="button">Continue to Module 3<span class="btn__next">›</span></a>
             </div>
         </div>

content/en/docs/tutorials/kubernetes-basics/explore/explore-interactive.html

@@ -29,6 +29,8 @@
         </div>
         <div class="row">
             <div class="col-md-12">
+            	<a class="btn btn-lg btn-success" href="/docs/tutorials/kubernetes-basics/deploy-app/deploy-intro/" role="button">Return to Module 2<span class="btn__next">›</span></a>
+            	<a class="btn btn-lg btn-success" href="/docs/tutorials/kubernetes-basics/" role="button">Home<span class="btn__next">›</span></a>
                 <a class="btn btn-lg btn-success" href="/docs/tutorials/kubernetes-basics/expose/expose-intro/" role="button">Continue to Module 4<span class="btn__next">›</span></a>
             </div>
         </div>

content/en/docs/tutorials/kubernetes-basics/expose/expose-interactive.html

@@ -26,6 +26,8 @@
         </div>
         <div class="row">
             <div class="col-md-12">
+            	<a class="btn btn-lg btn-success" href="/docs/tutorials/kubernetes-basics/explore/explore-intro/" role="button">Return to Module 3<span class="btn__next">›</span></a>
+            	<a class="btn btn-lg btn-success" href="/docs/tutorials/kubernetes-basics/" role="button">Home<span class="btn__next">›</span></a>
                 <a class="btn btn-lg btn-success" href="/docs/tutorials/kubernetes-basics/scale/scale-intro/" role="button">Continue to Module 5<span class="btn__next">›</span></a>
             </div>
         </div>