feat(isabelle-edits): Modify index page layout

This new page structure for the home page makes it so you have more control over the index.tpl file. By default, if the index.tpl file is full width (meaning no side columns) the container becomes fluid and full-width.  For each section, you need to define a container, rows and columns.  This way you can easily have full-width background images for only certain sections.

falcon/templates/layouts/layout-full-width.tpl

@@ -28,7 +28,7 @@
 {block name='right_column'}{/block}
 
 {block name='content_wrapper'}
-  <div id="content-wrapper" class="col-12 js-content-wrapper">
+  <div id="content-wrapper" class="{if $page.page_name != 'index' || !isset($page.body_classes['layout-full-width'])}col-12 {/if}js-content-wrapper">
     {hook h="displayContentWrapperTop"}
     {block name='content'}
       <p>Hello world! This is HTML5 Boilerplate.</p>