Upgrade to Docusaurus 2 alpha 66

Summary:
Saw a new version came out. Only breaking change appears
to be that links are now required to be non-empty,
which sounds quite reasonable.

Reviewed By: nikoant

Differential Revision: D25119837

fbshipit-source-id: 758578d4f7f8045b59918f107438f3c8231bb790

desktop/app/src/ui/components/data-inspector/DataInspector.tsx

@@ -320,7 +320,7 @@ const recursiveMarker = <RecursiveBaseWrapper>Recursive</RecursiveBaseWrapper>;
  * An expandable data inspector.
  *
  * This component is fairly low level. It's likely you're looking for
- * [`<ManagedDataInspector>`]().
+ * [`<ManagedDataInspector>`](#manageddatainspector).
  */
 const DataInspector: React.FC<DataInspectorProps> = memo(
   function DataInspectorImpl({

website/package.json

@@ -11,8 +11,8 @@
   },
   "devDependencies": {
     "@babel/parser": "^7.8.3",
-    "@docusaurus/core": "^2.0.0-alpha.61",
-    "@docusaurus/preset-classic": "^2.0.0-alpha.61",
+    "@docusaurus/core": "^2.0.0-alpha.66",
+    "@docusaurus/preset-classic": "^2.0.0-alpha.66",
     "classnames": "^2.2.6",
     "docblock-parser": "^1.0.0",
     "docusaurus-plugin-internaldocs-fb": "^0.5.2",