Show plugin documentation in Flipper

Reviewed By: passy

Differential Revision: D29392524

fbshipit-source-id: 675de1fc070b1b8b22d0b27721c16dbd6f7076ef

desktop/app/package.json

@@ -54,6 +54,7 @@
     "react-async": "^10.0.0",
     "react-debounce-render": "^7.0.0",
     "react-dom": "^17.0.1",
+    "react-electron-web-view": "^2.0.1",
     "react-element-to-jsx-string": "^14.3.1",
     "react-markdown": "^6.0.2",
     "react-player": "^2.9.0",

desktop/app/src/sandy-chrome/CenteredContainer.tsx

@@ -0,0 +1,18 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {Layout, styled} from '../ui';
+
+export const CenteredContainer = styled(Layout.Container)({
+  width: '100%',
+  height: '100%',
+  flexGrow: 1,
+  alignItems: 'center',
+  justifyContent: 'center',
+});