Feature/gallery view (#6578)

* add gallery view, display images in grid layout

* remove redundant code

* clean up redundant code, improve responsive gallery

* improve gaps in gallery

frontend/src/pages/lib-content-view/lib-content-container.js

@@ -271,6 +271,7 @@ class LibContentContainer extends React.Component {
                 sortOrder={this.props.sortOrder}
                 sortItems={this.props.sortItems}
                 viewId={this.props.viewId}
+                viewType={this.props.viewType}
               />
             </div>
           }