Add links to next lessons in index.html files.

Author: thejessleigh

lessons/lesson_2_fizzbuzz/index.html

@@ -316,6 +316,18 @@ <h3>Challenge Rules:</h3>
             </div>
         </div>
     </div>
+
+    <div class="row">
+        <div class="col s12 m12 l6">
+            <div class="card indigo lighten-5">
+                <div class="card-content black-text">
+                    <p>
+                        On to <a href="../lesson_3_calculator/index.html">Lesson 3: Calculator!</a>!
+                    </p>
+                </div>
+            </div>
+        </div>
+    </div>
 </div>
 </body>
 </html>

lessons/lesson_3_calculator/index.html

@@ -225,7 +225,31 @@ <h3>Example</h3>
         </div>
     </div>
 
-    <!--TODO: Add bonus section encouraging user to create unit tests and write code for a product function-->
+    <h3>Stretch Goals</h3>
+    <div class="row">
+        <div class="col s12 m12 l6">
+            <div class="card indigo lighten-5">
+                <div class="card-content black-text">
+                    <p>
+                        <!--TODO: Add bonus section encouraging user to create unit tests and write code for a product function-->
+                    </p>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <div class="row">
+        <div class="col s12 m12 l6">
+            <div class="card indigo lighten-5">
+                <div class="card-content black-text">
+                    <p>
+                        You're read for the <a href="../lesson_4_temperature/index.html">Lesson 4: Temperature</a>!
+                    </p>
+                </div>
+            </div>
+        </div>
+    </div>
+
 </div>
 
 </body>

lessons/lesson_4_temperature/index.html

@@ -208,6 +208,19 @@ <h3>Example</h3>
         </div>
     </div>
 
+    <div class="row">
+        <div class="col s12 m12 l6">
+            <div class="card indigo lighten-5">
+                <div class="card-content black-text">
+                    <p>
+                        Get ready for <a href="../lesson_5_pig_latin/index.html">Lesson 5: Pig Latin</a>. This one is
+                        particularly exciting!
+                    </p>
+                </div>
+            </div>
+        </div>
+    </div>
+
 </div>
 </body>
 </html>