Clarify .env quoting and add dotenv-linter recommendation

[agrajagco]

This is an update to the project Readme.md that handles properly quoting special characters and offers a way to cleanup a broken docker compose that has a malformed .env vs /home/node/.n8n/config from the n8n volume.

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Note

Clarifies quoting special characters in .env, adds troubleshooting cleanup/redeploy steps, and recommends dotenv-linter.

• Docs (README)
  • .env guidance:
    • Explain quoting special characters in .env to avoid parsing issues.
    • Provide example values for password, N8N_ENCRYPTION_KEY, and N8N_USER_MANAGEMENT_JWT_SECRET in quotes.
    • Note common error when keys mismatch and reference /home/node/.n8n/config message.
    • Recommend using dotenv-linter to validate env files.
  • Troubleshooting: Cleanup and redeploy:
    • Add steps to reset Docker Compose setup: docker compose down --volumes --remove-orphans, remove volumes (n8n_storage, postgres_storage, ollama_storage, qdrant_storage), optionally remove images, and verify with docker ps -a and docker volume ls before redeploying.

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