docs: update spectrum-ts documentation for v8.0.0

[photon-action-bot]

Documentation Update: spectrum-ts v8.0.0

This PR updates documentation for spectrum-ts based on the v8.0.0 release.

Release Notes

New Features

• Added @spectrum-ts/fastify, a first-party Fastify adapter for Spectrum webhooks. It mounts native and Fusor webhook handling with one server.register(...) call.

Breaking Changes

• richlink is now outbound-only. Inbound rich links now arrive as plain text, and Richlink no longer exposes lazy title, summary, or cover metadata helpers.
• iMessage markdown no longer enables Apple data detection automatically for links. Markdown links still render into readable text, but link preview/data detection behavior is left to the platform/client.

Improvement

• Added Fastify docs and updated webhook docs to make raw-body handling, native webhook verification, and inbound link behavior easier to understand. ✨

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Version: 8.0.0

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