Some sidebar nav fixes.

- Set isExpanded state to false when window width is < 700px.
- Set `pointer-events` to `none` for logo to allow users to easily click on hamburger icon.

awx/ui/client/lib/components/layout/_index.less

@@ -49,6 +49,7 @@
                     width: @main-menu-width;
                     margin: @main-menu-margin;
                     flex: initial;
+                    pointer-events: none;
                 }
             }
 

awx/ui/client/lib/components/layout/side-nav.directive.js

@@ -44,6 +44,14 @@ function AtSideNavController ($scope, $window) {
             vm.isExpanded = false;
         }
     });
+
+    $(window).resize(() => {
+        if ($window.innerWidth <= breakpoint) {
+            vm.isExpanded = false;
+        } else {
+            vm.isExpanded = true;
+        }
+    });
 }
 
 AtSideNavController.$inject = ['$scope', '$window'];