Update links in home, header, footer, whatisk8s (#3833)

* home page, header, footer

* docs/whatisk8s

* /docs/user-guide/compute-resources/

* /docs/concepts/overview/what-is-kubernetes.md

_includes/footer.html

@@ -1,8 +1,8 @@
 <footer>
     <main class="light-text">
         <nav>
-            <a href="/docs/hellonode/">Get Started</a>
-            <a href="/docs/">Documentation</a>
+            <a href="/docs/tutorials/stateless-application/hello-minikube/">Get Started</a>
+            <a href="/docs/home/">Documentation</a>
             <a href="http://blog.kubernetes.io/">Blog</a>
             <a href="/partners/">Partners</a>
             <a href="/community/">Community</a>
@@ -20,7 +20,7 @@
                 <a href="https://calendar.google.com/calendar/embed?src=nt2tcnbtbied3l6gi2h29slvc0%40group.calendar.google.com" class="calendar"><span>Events Calendar</span></a>
             </div>
             <div>
-                <a href="/docs/getting-started-guides/" class="button">Get Kubernetes</a>
+                <a href="/docs/setup/pick-right-solution/" class="button">Get Kubernetes</a>
                 <a href="https://github.com/kubernetes/kubernetes" class="button">Contribute</a>
             </div>
         </div>