Bump y18n from 4.0.0 to 4.0.1 in /website (#2141)

Summary:
Bumps [y18n](https://github.com/yargs/y18n) from 4.0.0 to 4.0.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/yargs/y18n/blob/master/CHANGELOG.md">y18n's changelog</a>.</em></p>
<blockquote>
<h1>Change Log</h1>
<p>All notable changes to this project will be documented in this file. See <a href="https://github.com/conventional-changelog/standard-version">standard-version</a> for commit guidelines.</p>
<h3><a href="https://www.github.com/yargs/y18n/compare/v5.0.4...v5.0.5">5.0.5</a> (2020-10-25)</h3>
<h3>Bug Fixes</h3>
<ul>
<li>address prototype pollution issue (<a href="https://www.github-redirect.dependabot.com/yargs/y18n/issues/108">https://github.com/facebook/flipper/issues/108</a>) (<a href="a9ac604abf">a9ac604</a>)</li>
</ul>
<h3><a href="https://www.github.com/yargs/y18n/compare/v5.0.3...v5.0.4">5.0.4</a> (2020-10-16)</h3>
<h3>Bug Fixes</h3>
<ul>
<li><strong>exports:</strong> node 13.0 and 13.1 require the dotted object form <em>with</em> a string fallback (<a href="https://www.github-redirect.dependabot.com/yargs/y18n/issues/105">https://github.com/facebook/flipper/issues/105</a>) (<a href="4f85d80dba">4f85d80</a>)</li>
</ul>
<h3><a href="https://www.github.com/yargs/y18n/compare/v5.0.2...v5.0.3">5.0.3</a> (2020-10-16)</h3>
<h3>Bug Fixes</h3>
<ul>
<li><strong>exports:</strong> node 13.0-13.6 require a string fallback (<a href="https://www.github-redirect.dependabot.com/yargs/y18n/issues/103">https://github.com/facebook/flipper/issues/103</a>) (<a href="e39921e101">e39921e</a>)</li>
</ul>
<h3><a href="https://www.github.com/yargs/y18n/compare/v5.0.1...v5.0.2">5.0.2</a> (2020-10-01)</h3>
<h3>Bug Fixes</h3>
<ul>
<li><strong>deno:</strong> update types for deno ^1.4.0 (<a href="https://www.github-redirect.dependabot.com/yargs/y18n/issues/100">https://github.com/facebook/flipper/issues/100</a>) (<a href="3834d9ab13">3834d9a</a>)</li>
</ul>
<h3><a href="https://www.github.com/yargs/y18n/compare/v5.0.0...v5.0.1">5.0.1</a> (2020-09-05)</h3>
<h3>Bug Fixes</h3>
<ul>
<li>main had old index path (<a href="https://www.github-redirect.dependabot.com/yargs/y18n/issues/98">https://github.com/facebook/flipper/issues/98</a>) (<a href="124f7b047b">124f7b0</a>)</li>
</ul>
<h2><a href="https://www.github.com/yargs/y18n/compare/v4.0.0...v5.0.0">5.0.0</a> (2020-09-05)</h2>
<h3>{emoji:26a0} BREAKING CHANGES</h3>
<ul>
<li>exports maps are now used, which modifies import behavior.</li>
<li>drops Node 6 and 4. begin following Node.js LTS schedule (<a href="https://github-redirect.dependabot.com/yargs/y18n/issues/89">https://github.com/facebook/flipper/issues/89</a>)</li>
</ul>
<h3>Features</h3>
<ul>
<li>add support for ESM and Deno <a href="https://www.github-redirect.dependabot.com/yargs/y18n/issues/95">https://github.com/facebook/flipper/issues/95</a>) (<a href="4d7ae94bcb">4d7ae94</a>)</li>
</ul>

</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/yargs/y18n/commits">compare view</a></li>
</ul>
</details>
<details>
<summary>Maintainer changes</summary>
<p>This version was pushed to npm by <a href="https://www.npmjs.com/~oss-bot">oss-bot</a>, a new releaser for y18n since your current version.</p>
</details>
<br />

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</details>

Pull Request resolved: https://github.com/facebook/flipper/pull/2141

Reviewed By: mweststrate

Differential Revision: D27426522

Pulled By: passy

fbshipit-source-id: aa1f37054a9f61f27abcbbb28ba6b98f7d09b44a

website/yarn.lock

@@ -12095,9 +12095,9 @@ xtend@^4.0.0, xtend@^4.0.1, xtend@~4.0.1:
   integrity sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==
 
 y18n@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.0.tgz#95ef94f85ecc81d007c264e190a120f0a3c8566b"
-  integrity sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.1.tgz#8db2b83c31c5d75099bb890b23f3094891e247d4"
+  integrity sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ==
 
 yallist@^3.0.2:
   version "3.1.1"