Add docs link to App Router readme

[blakewilson]

Tasks

• I have signed a Contributor License Agreement (CLA) with WP Engine.
• If a code change, I have written testing instructions that the whole team & outside contributors can understand.
• I have written and included a comprehensive changeset to properly document the changes I've made.

Description

This PR adds a link to the getting started docs in the App Router readme.

Related Issue(s):

Testing

Screenshots

Documentation Changes

Dependant PRs

[changeset-bot]

⚠️ No Changeset found

Latest commit: 70fb85e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

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

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌