docs: update readme and reference

[hassiebp]

Important

Update documentation and improve API organization for v3 release.

• Documentation:
  • Update README.md to use CDN-hosted logo and update version references from v2 to v3.
  • Simplify documentation links in README.md to centralize v3 SDK documentation.
• API Improvements:
  • Remove OpenTelemetry span attributes from public API in langfuse/__init__.py.
  • Add LangfuseSpan, LangfuseGeneration, LangfuseEvent to public API in langfuse/__init__.py.
  • Introduce __all__ in langfuse/__init__.py for explicit public interface definition.

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Disclaimer: Experimental PR review

Greptile Summary

This PR makes two main types of changes:

1. Documentation updates in README.md:

   • Updates the banner image URL to use a CDN-hosted white logo
   • Updates version references from v2 to v3
   • Simplifies documentation by centralizing links to v3 SDK documentation

2. API improvements in langfuse/__init__.py:

   • Removes OpenTelemetry span attributes from public API
   • Adds three new classes to public API: LangfuseSpan, LangfuseGeneration, LangfuseEvent
   • Introduces __all__ declaration for explicit public interface definition

These changes reflect a professional effort to improve documentation organization and API cleanliness as part of the v3 release.

Confidence score: 4/5

1. This PR is safe to merge as it primarily contains documentation and API organization improvements
2. High confidence due to the non-breaking nature of changes and clear improvement in API organization
3. Files needing attention:
   • langfuse/__init__.py - Verify that removed OpenTelemetry attributes won't affect existing users

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