Migrate bedstack.js.org to Fumadocs

[yamcodes]

Clear and concise description of the problem

It's easier for me to maintain a Fumadocs site like https://arkenv.js.org than a Vitepress site, since my background is in React.

Suggested solution

Switch to Fumadocs.

Alternative

No response

Additional context

No response

Validations

• Read the Contributing Guide.
• Read the README.md.
• Check that there isn't already an issue that requests the same feature.