Fix: Update HTTP API documentation link to the correct Farcaster docs

[VolodymyrBg]

Replaced the outdated and broken link to the HTTP API documentation in the README with the correct URL pointing to the official Farcaster Hubble HTTP API docs. This ensures users can easily find up-to-date API reference material.

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PR-Codex overview

This PR updates the documentation link for the HTTP API endpoints in the README.md file to point to a new URL.

Detailed summary

• Updated the link for the HTTP API endpoints from https://www.thehubble.xyz/docs/httpapi/httpapi.html to https://docs.farcaster.xyz/reference/hubble/httpapi/message.

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Latest commit: 3939325

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