Feature teachable machine on the homepage (#176)

* changes to homepage

* remove line

* remove line

* teachable machine homepage

Author: Nikhil Thorat

demos/homepage/_includes/header.html

@@ -1,12 +1,8 @@
 <!-- Header -->
 <header class="mdl-layout__header mdl-layout--fixed-header">
   <script>
-<<<<<<< HEAD
-    if (location.protocol !== "https:" && location.hostname === "deeplearnjs.org") {
-=======
     if (location.protocol !== "https:" &&
         location.hostname === 'deeplearnjs.org') {
->>>>>>> 10a3779b91408069eb47a988bfed2a30a7304bac
       location.protocol = "https:";
     }
   </script>