update icon in homepage

Author: wendychaung

_layouts/default.html

@@ -24,7 +24,7 @@ <h2>
                     <div class="box ">
                         <div class="img-box">
                             <!--                            <img src="images/s1.png" alt="">-->
-                            <i class="fa fa-android"></i>
+                            <i class="fa fa-apple"></i>
                         </div>
                         <div class="detail-box">
                             <h5>
@@ -68,7 +68,7 @@ <h5>
                     <div class="box ">
                         <div class="img-box">
                             <!--                            <img src="images/s1.png" alt="">-->
-                            <i class="fa fa-android"></i>
+                            <i class="fa fa-windows"></i>
                         </div>
                         <div class="detail-box">
                             <h5>