revert: Remove Keka API integration, restore embed

[vibemarketerpromax]

Summary

• Reverts PR feat: Replace Keka embed with native API-driven job listings #81 which replaced the Keka embed with API-driven job listings
• API approach requires storing credentials in CI/CD secrets on a public repo - not appropriate
• Restores the original Keka embed iframe (KekaJobsEmbed.tsx)
• Removes all API client code, career components, and scheduled rebuild workflow
• Reverts CI workflow changes that referenced KEKA_* secrets

Reverted files

Restored	Deleted
components/KekaJobsEmbed.tsx	lib/keka.ts
app/careers/page.tsx (original)	lib/keka-jobs.ts
app/globals.css (embed CSS)	components/careers/*
.env.example (no KEKA vars)	app/careers/CareersClient.tsx
.github/workflows/ci.yml	.github/workflows/rebuild-jobs.yml
.github/workflows/nextjs.yml

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