Add android app links content and images

[ianrumac]

Adds documentation for adding Android App Links support

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Note

Adds concise Android App Links setup and handling guidance with images to content/shared/in-app-paywall-previews.mdx.

• Docs (content/shared/in-app-paywall-previews.mdx):
  • Android App Links:
    • Setup steps: add app fingerprints/schema in Stripe settings; update AndroidManifest.xml with verified https intent-filter for Superwall domain.
    • Handling: pass deep links to Superwall.handleDeepLink in onCreate and onNewIntent.
    • Testing: enable “Open supported links” for debug; link to Android verification guide; note generated assetlinks.json.
    • Adds illustrative images (/images/android-app-links-fingerprints.png, /images/android-app-links-debug.png).

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