fix homepage links (#6381)

overrides/home.html

@@ -16,12 +16,12 @@
           </h2>
           <p class="call-to-action">
             <a
-              href="{{ 'getting-started/tutorial' | url }}"
+              href="{{ 'docs/getting-started/tutorial' | url }}"
               class="md-button black md-button--primary"
               >Try the tutorial</a
             >
             <a
-              href="{{ 'install/' | url }}"
+              href="{{ 'docs/install/' | url }}"
               class="md-button white md-button--secondary"
               >Install Knative on your cluster</a
             >