Added 5th tutorial of get started series to the docs site

wiki/content/get-started/index.md

@@ -59,6 +59,18 @@ title = "Get Started with Dgraph"
           </p>
         </div>
       </div>
+      <div class="col-12 col-sm-12">
+        <div class="section-item">
+          <div class="section-name">
+            <a href="{{< relref "tutorial-5/index.md">}}">
+              5 - String Indices and Modeling Tweet Graph
+            </a>
+          </div>
+          <p class="section-desc">
+            Learn about string indices, modeling tweet graph, and keyword-based searching.
+          </p>
+        </div>
+      </div>
     </div>
   </div>
 </section>

wiki/content/tutorial-3/index.md

@@ -633,8 +633,6 @@ How about the geo-location querying capabilities?
 
 Sounds interesting?
 
-See you all soon in the next tutorial. Till then, happy Graphing!
-
 Check out our next tutorial of the getting started series [here](/tutorial-4/).
 
 ### Need Help

wiki/content/tutorial-4/index.md

@@ -385,15 +385,7 @@ We'll explore the string type indices in detail.
 
 Sounds interesting?
 
-See you all soon in the next tutorial. Till then, happy Graphing!
-
-## What's Next?
-- Go to [Clients]({{< relref "clients/index.md" >}}) to see how to communicate
-with Dgraph from your application.
-- Take the [Tour](https://tour.dgraph.io) for a guided tour of how to write queries in Dgraph.
-- A wider range of queries can also be found in the [Query Language](/query-language) reference.
-- See [Deploy](/deploy) if you wish to run Dgraph
-  in a cluster.
+Check out our next tutorial of the getting started series [here](/tutorial-5/).
 
 ## Need Help