remove beta label

[samuelcolvin]

No description provided.

[hyperlint-ai]

PR Change Summary

Removed beta labels and disclaimers from the documentation to indicate that the API is no longer in beta.

• Eliminated beta disclaimers from the README.md file
• Removed early beta notes from the graph documentation
• Updated the index documentation to remove beta references

Modified Files

• README.md
• docs/graph.md
• docs/index.md

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