Updates to standalone gallery (#91)

* Add hyperlink icon for links in DialogComponent

* Use a Cosmos DB image for sample Persona

* Fix tests

* Update standalone gallery behavior to match DE gallery

* Use /gallery endpoint for gallery

* Update Gallery Card style to remove buttons in standalone mode

* Address comments

* Add text banner

src/Explorer/Controls/NotebookGallery/GalleryAndNotebookViewerComponentAdapter.tsx

@@ -0,0 +1,23 @@
+import ko from "knockout";
+import * as React from "react";
+import { ReactAdapter } from "../../../Bindings/ReactBindingHandler";
+import {
+  GalleryAndNotebookViewerComponentProps,
+  GalleryAndNotebookViewerComponent
+} from "./GalleryAndNotebookViewerComponent";
+
+export class GalleryAndNotebookViewerComponentAdapter implements ReactAdapter {
+  public parameters: ko.Observable<number>;
+
+  constructor(private props: GalleryAndNotebookViewerComponentProps) {
+    this.parameters = ko.observable<number>(Date.now());
+  }
+
+  public renderComponent(): JSX.Element {
+    return <GalleryAndNotebookViewerComponent {...this.props} />;
+  }
+
+  public triggerRender(): void {
+    window.requestAnimationFrame(() => this.parameters(Date.now()));
+  }
+}