docs: add Metalyoung to showcase

[metal-young]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

Add https://www.metalyoung.com to showcase.

Test Plan

N/A

Related issues/PRs

N/A

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 89	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 75	🟢 100	🟢 100	🟢 100	🟢 90	Report

[Josh-Cena]

Thanks

你可以在你的 docusaurus.config.js 里加一个 i18n 字段，比如这样：

docusaurus/packages/create-docusaurus/templates/classic/docusaurus.config.js

Lines 22 to 28 in feb9cf0

	// Even if you don't use internalization, you can use this field to set useful
	// metadata like html lang. For example, if your site is Chinese, you may want
	// to replace "en" with "zh-Hans".
	i18n: {
	defaultLocale: 'en',
	locales: ['en'],
	},

这样网站上的文本都会变成中文，对 SEO 也有好处

[metal-young]

谢谢~