sample(grid-lite): create grid-lite sample with theme switcher (#1151)

Author: didimmova

browser/public/index.html

@@ -612,6 +612,7 @@
            <a class="nav-link" href="#" data-nav="/samples/grids/grid-lite/sort-config-grid">─<span>Sort Config Grid</span></a> 
            <a class="nav-link" href="#" data-nav="/samples/grids/grid-lite/sort-config-pipeline">─<span>Sort Config Pipeline</span></a> 
            <a class="nav-link" href="#" data-nav="/samples/grids/grid-lite/sort-config-sample">─<span>Sort Config Sample</span></a> 
+           <a class="nav-link" href="#" data-nav="/samples/grids/grid-lite/styling-config-themes">─<span>Styling Config Themes</span></a> 
            <a class="nav-link" href="#" data-nav="/samples/grids/grid-lite/styling-custom-theme">─<span>Styling Custom Theme</span></a> 
        </div>
        <label id="nav-hierarchical-grid" class="nav-component">Hierarchical Grid</label>