Remove pitch deck route

[jeevanpillay]

Summary

• Remove the old apps/www /pitch-deck route tree, slide/export helpers, pitch deck data, and pitch deck image assets.
• Remove /pitch-deck from MFE route ownership and stale nav/robots references.
• Add assertions that the old www MFE table and production robots output no longer include pitch deck.

Stack

• Depends on Add TanStack Start marketing app #811.

Test Plan

• pnpm --filter @lightfast/app exec vitest run src/__tests__/microfrontends-config.test.ts
• pnpm --filter @lightfast/www-start exec vitest run src/lib/seo-discovery.test.ts
• pnpm --filter @lightfast/www-start typecheck
• pnpm --filter @lightfast/www-start build
• cd apps/www && pnpm with-env next typegen
• pnpm --filter @lightfast/www typecheck
• pnpm --filter @lightfast/www build

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
lightfast-app	Error		Jun 4, 2026 8:05am
lightfast-mcp	Ready	Preview, Comment	Jun 4, 2026 8:05am
lightfast-platform	Ready	Preview, Comment	Jun 4, 2026 8:05am
lightfast-www	Ready	Preview, Comment	Jun 4, 2026 8:05am

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep retired deck path on public routing

Because lightfast-app is the default microfrontend, removing /pitch-deck from the marketing routing makes that public URL fall through to the authenticated app; apps/app/src/proxy.ts then redirects unauthenticated non-public paths to /sign-in. If the intent is to retire the deck, the path should still be claimed by a public marketing app so the deleted page can produce a public 404/410/redirect instead of sending old external links into the app sign-in flow.

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[jeevanpillay]

Folded this cleanup into #811 so the migration lands as one PR.