feat: add opentelemetry preview documentation

[Steffen911]

Important

Adds OpenTelemetry integration documentation and updates routing and configuration for Langfuse.

• Documentation:
  • Adds example-openlit.md, example-openllmetry.md, example-pydantic-ai.md, and example-opentelemetry-collector.mdx for OpenTelemetry integration examples.
  • Updates get-started.mdx with OpenTelemetry setup instructions and integration examples.
• Routing:
  • Updates cookbook/_routes.json to include new OpenTelemetry example paths.
  • Adds non-permanent redirect for /docs/opentelemetry to /docs/opentelemetry/get-started in next.config.mjs.
• Meta Configuration:
  • Updates pages/docs/_meta.tsx and pages/docs/opentelemetry/_meta.tsx to include OpenTelemetry sections and examples.

^{This description was created by for 598e780. It will automatically update as commits are pushed.}

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Name	Status	Preview	Updated (UTC)
langfuse-docs	✅ Ready (Inspect)	Visit Preview	Feb 2, 2025 11:50pm

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[github-actions]

📦 Next.js Bundle Analysis for langfuse-docs

This analysis was generated by the Next.js Bundle Analysis action. 🤖

New Pages Added

The following pages were added to the bundle from the code in this PR:

Page	Size (compressed)	First Load	% of Budget (350 KB)
/docs/opentelemetry/_meta	270 B	334.33 KB	95.52%
/docs/opentelemetry/example-openlit	33.55 KB	367.62 KB	105.03%
/docs/opentelemetry/example-openllmetry	33.63 KB	367.7 KB	105.06%
/docs/opentelemetry/example-opentelemetry-collector	34.25 KB	368.31 KB	105.23%
/docs/opentelemetry/example-pydantic-ai	34.05 KB	368.11 KB	105.18%
/docs/opentelemetry/get-started	36.27 KB	370.34 KB	105.81%
/guides/cookbook/otel_integration_openlit	33.55 KB	367.61 KB	105.03%
/guides/cookbook/otel_integration_openllmetry	33.63 KB	367.69 KB	105.06%
/guides/cookbook/otel_integration_pydantic_ai	34.04 KB	368.11 KB	105.17%
/guides/cookbook/otel_integration_traceloop	32.53 KB	366.59 KB	104.74%

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