docs: App Router Docs from website

[moonmeister]

Description

Prepping for #2019 by adding docs from the faustjs.org to the package folder. As this package is being deprecated we're moving docs here for legacy reference and removing them from the website.

Documentation Changes

Doc links and images should be working. The Readme has also been updated to reflect the deprecated status.

---

• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1209144200651059

[changeset-bot]

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Latest commit: 8ea2d3d

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[github-actions]

📦 Next.js Bundle Analysis for @faustwp/getting-started-example

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This PR introduced no changes to the JavaScript bundle! 🙌