docs: add vietnamese landingpage

[congnguyendinh0]

[!IMPORTANT] Adds Vietnamese language support with a new page and menu item in FooterMenu.tsx and vn.mdx.

• New Language Support:
  • Adds Vietnamese language option to FooterMenu.tsx with name: "🇻🇳 Vietnamese" and href: "/vn".
  • Adds Vietnamese page metadata in _meta.tsx with title: "Vietnamese Overview".
• Content:
  • Introduces vn.mdx with detailed content about Langfuse in Vietnamese, covering features, integrations, getting started, support, and community involvement.

^{This description was created by for f572f2c1c13a02ea1cdf33d3d7a01901517b9c30. It will automatically update as commits are pushed.}

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All committers have signed the CLA.

[jannikmaierhoefer]

Hi @congnguyendinh0 - this is great. Thank you for your contribution! :)

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Name	Status	Preview	Updated (UTC)
langfuse-docs	✅ Ready (Inspect)	Visit Preview	Feb 24, 2025 6:52pm

[marcklingen]

@congnguyendinh0 I need to make minor changes before we can merge this change, can you grant me push rights on this branch?

[marcklingen]

Thank you for your contribution!

[congnguyendinh0]

@congnguyendinh0 I need to make minor changes before we can merge this change, can you grant me push rights on this branch?

Just did :)