Make .dev.vars and .env consistent and remove deprecated templates

[GregBrimble]

The old templates don't live there any more, so just removing for now. Also ties in with my recent changes to Deploy to Cloudflare and @petebacondarwin 's .env stuff.

---

• Tests
  • Tests included
  • Tests not necessary because: 🔥
• Public documentation
  • Cloudflare docs PR(s): Env vars, secrets and Secrets Store secrets in Deploy to Cloudflare cloudflare-docs#24027 and Document support for secrets and env vars templates#750
  • Documentation not necessary because:
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: not a Wrangler change

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Latest commit: 7782a9b

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commit: 7782a9b