Add quickstart that uses prebuilt components

This book aims to make it easier to get started working with Wasm components. The initial quickstart should not require a user to download language specific tooling. Instead, once the Bytecode Alliance registry is stood up, we should have a quickstart that uses prebuilt components that are hosted in a registry. We can walk through using `wasm-tools component wit` to see the world each component exposes and use `wac plug` to compose.

Start by reviewing the existing component-docs quickstarts and the proposed Bytecode Alliance registry flow. Use `wasm-tools component wit` to inspect the prebuilt components and `wac plug` to compose them. Done means the book includes a working quickstart that needs no language-specific tooling and uses components hosted in the registry.

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