- Adds a summary to the top of the env-file.md document.
- This provides a brief overview of the file's purpose.
- The summary explains the role of the .env file in YAMS configuration.
- Clarifies the purpose and usage of the `.env` file.
- Adds a new page dedicated to explaining the `.env` file.
- Improves the explanation of how environment variables are used in custom containers.
- Adds details about default environment variables and their purpose.
- Includes a section on VPN configuration and `.env` usage.
