docs: add vapi integration

[jannikmaierhoefer]

Important

Adds documentation for Vapi integration with Langfuse, including setup instructions and benefits overview.

• Documentation:
  • Add vapi entry to _meta.tsx.
  • New file vapi.mdx added for Vapi integration documentation.
• Content:
  • Describes Vapi and Langfuse, their functionalities, and integration benefits.
  • Provides step-by-step guide to obtain and set Langfuse credentials in Vapi.
  • Includes instructions to view traces in Langfuse and use its evaluation and debugging tools.
• Integration Overview:
  • Add Vapi to the integrations list in overview.mdx.

^{This description was created by for 4e6a1ee. It will automatically update as commits are pushed.}

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Name	Status	Preview	Updated (UTC)
langfuse-docs	✅ Ready (Inspect)	Visit Preview	Dec 10, 2024 1:16pm

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📦 Next.js Bundle Analysis for langfuse-docs

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New Page Added

The following page was added to the bundle from the code in this PR:

Page	Size (compressed)	First Load	% of Budget (350 KB)
/docs/integrations/other/vapi	32.12 KB	364.91 KB	104.26%

[jannikmaierhoefer]

I removed the two images and pushed them separately: #1086