Fix redirect from wiki

Summary: Created from Diffusion's 'Open in Editor' feature.

Reviewed By: nikoant

Differential Revision: D25952493

fbshipit-source-id: 0509b9e0118afcab4e286757131bfa10cfc920b0

website/docusaurus.config.js

@@ -225,6 +225,10 @@ const siteConfig = {
             to: '/docs/getting-started/index',
             from: ['/docs/fb/using-flipper-at-facebook'],
           },
+          {
+            to: '/docs/getting-started/index',
+            from: ['/docs/fb/index'],
+          },
         ],
       },
     ],