R1:b9ea6f1ce823

docs/file_domain: remove cloudflare mention of autominify

Summary:
[Auto Minify](https://developers.cloudflare.com/speed/optimization/content/auto-minify/)[1][2] is deprecated and will be removed after 2024-08-05.

(For distant future where Cloudflare deletes the docs)
[1]: [web.archive.org](https://web.archive.org/web/20240507123639/https://developers.cloudflare.com/speed/optimization/content/auto-minify/)
[2]: [archive.today](https://archive.md/wWPpM)

Signed-off-by: Yongmin Hong <revi@omglol.email>…