chore: update docs

[jonaslagoni]

Note

Updates docs to expand core features, add JSON Schema input link, include models preset in inputs, fix migrations path with new 0.55.1 breaking change note, and simplify OpenAPI docs.

• README
  • Expanded Core Features: added AsyncAPI/OpenAPI generator capabilities (protocol helpers, client, models, types), JSON Schema support, and clarified customization/integration notes.
• Docs Overview (docs/README.md)
  • Added JSON Schema to Inputs list.
  • Updated Migrations link to migrations/README.md.
• Inputs Docs
  • docs/inputs/asyncapi.md: Added models preset to presets table; refined FAQ customization guidance.
  • docs/inputs/openapi.md: Added models preset; removed verbose validation/examples/best-practices sections; simplified FAQ; clarified custom generator link.
• Migrations
  • Added docs/migrations/v0.md section for 0.55.1 noting AsyncAPI Modelina upgrade to next with potential breaking changes.

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