Update link to main route to index route

Author: erikap

app/templates/application.hbs

@@ -5,7 +5,7 @@
       <img src="./assets/images/search.png" class="img" alt="Search icon" />
       <div class="text">Search the docs...</div>
     </div>
-    <LinkTo @route="main">
+    <LinkTo @route="index">
       <div class="logo">
         <div class="text">SEMANTIC</div>
         <img src="./assets/images/logo.png" class="img" alt="Semantic works" />