fix(website): add Algolia search API key (#726)

Summary:
**Summary**

This PR update the docusaurus config to expose the Algolia search API key.

_note: Algolia search API keys can be disclosed publicly_

**Motivation**

Search does not work on the production website.

**Test plan**

- `cd website`
- `yarn start`
- Search

Pull Request resolved: #726

Reviewed By: motiz88

Differential Revision: D34105655

Pulled By: rh389

fbshipit-source-id: 6a9fda7e92ff27ddbf5212cca72c138ec3672f56

Author: shortcuts

website/docusaurus.config.js

@@ -94,7 +94,8 @@ const siteConfig = {
     },
     image: 'img/opengraph.png',
     algolia: {
-      apiKey: process.env.ALGOLIA_METRO_API_KEY || ' ',
+      apiKey: 'd51e7fbd21ccab3db4c83f0f736f6a3a',
+      appId: 'T38HJZTD87',
       indexName: 'metro',
     },
     gtag: {