feat(web checkout): clear up SDK setup requirements and add links

[dcrawbuck]

Summary

• Rewrites the Web Checkout SDK Setup page to add a clear prerequisites checklist with links to each dashboard setup step
• Replaces vague "What's Next?" section with actionable implementation steps linking directly to deep links setup, post-checkout redirecting, RevenueCat, and PurchaseController guides
• Adds testing and further reading sections with direct links

Closes SW-4835

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Note

Low Risk
Low risk documentation-only change that reorganizes the Web Checkout SDK Setup page and updates links; main risk is broken/incorrect doc links or guidance.

Overview
Rewrites web-checkout-sdk-setup.mdx to replace the platform picker and vague next steps with a clear prerequisites checklist linking to required dashboard setup steps.

Adds an ordered Implementation steps section linking to deep link setup, post-checkout redirecting, and optional RevenueCat/custom PurchaseController flows, plus new Testing and Further reading sections with direct links.

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[linear]

SW-4835 [docs] clear up web checkout SDK req steps, add links

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	superwall-docs-staging	f624a87	Commit Preview URL Branch Preview URL	Apr 11 2026, 12:50 AM