ISTWCMS-3590: fixing regions

source/_patterns/03-layouts/content/content.twig

-<div class="l-content">
-  {% if has_constrain %}
-    <div class="l-constrain {{ constrain_modifier_classes }}">
-  {% endif %}
+<main id="main" class="uw-main" role="main" tabindex="-1">
   {% block content %}
     Content Region Content
   {% endblock %}
-  {% if has_constrain %}
-    </div>
-  {% endif %}
-</div>
+</main>

source/_patterns/03-layouts/highlighted/highlighted.twig

+<div class="uw-highlighted">
+  {% block content %}
+  {% endblock %}
+</div>

source/_patterns/03-layouts/site-container/_site-container.scss

@@ -7,30 +7,20 @@
     grid-row: 1 / 2;
   }
 
-  .uw-main-nav {
+  .uw-highlighted {
     grid-column: 1 / 2;
     grid-row: 2 / 3;
   }
 
-  .region-highlighted {
-    grid-column: 1 / 2;
-    grid-row: 3 / 4;
-  }
-
-  .main {
+  .uw-main {
     background-color: $uw-white;
     grid-column: 1 / 2;
-    grid-row: 4 / 5;
+    grid-row: 3 / 4;
     min-height: 500px;
   }
 
-  .uw-site-footer {
-    grid-column: 1 / 2;
-    grid-row: 5 / 6;
-  }
-
   .uw-footer {
     grid-column: 1 / 2;
-    grid-row: 6 / 7;
+    grid-row: 4 / 5;
   }
-}
\ No newline at end of file
+}