docs: disable plugin-debug in production by default

[taraspos]

Motivation

Documentation says¹

• docusaurus/website/docs/api/plugins/plugin-debug.mdx

  Lines 13 to 21 in 0a89f48

  	The debug plugin will display useful debug information at [`http://localhost:3000/__docusaurus/debug`](http://localhost:3000/__docusaurus/debug).
  	It is mostly useful for plugin authors, that will be able to inspect more easily the content of the `.docusaurus` folder (like the creates routes), but also be able to inspect data structures that are never written to disk, like the plugin data loaded through the `contentLoaded` lifecycle.
  	:::info
  	If you use the plugin via the classic preset, the preset will **enable the plugin in development and disable it in production** by default (`debug: undefined`) to avoid exposing potentially sensitive information. You can use `debug: true` to always enable it or `debug: false` to always disable it.
  	If you use a standalone plugin, you may need to achieve the same effect by checking the environment:

But code snippet does the opposite. This change updates code snippet to disable plugin in production by default.

Footnotes

1. https://docusaurus.io/docs/api/plugins/@docusaurus/plugin-debug ↩

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	Report
/	🔴 46	🟢 98	🟢 96	🟢 100	Report
/docs/installation	🔴 49	🟢 97	🟢 100	🟢 100	Report
/docs/category/getting-started	🟠 71	🟢 100	🟢 100	🟠 86	Report
/blog	🟠 62	🟢 96	🟢 100	🟠 86	Report
/blog/preparing-your-site-for-docusaurus-v3	🔴 45	🟢 92	🟢 100	🟢 100	Report
/blog/tags/release	🟠 63	🟢 96	🟢 100	🟠 86	Report
/blog/tags	🟠 73	🟢 100	🟢 100	🟠 86	Report

[slorber]

LGTM thanks 👍

Need to wait for the CLA bot to report your signature (can't merge without)

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