#377 Update .env.example

Description

Related Issues

Type of Change

• Bug fix
• New feature
• Documentation
• Refactor
• Other (please describe):

Testing

Screenshots (if applicable)

Additional Notes

Summary by CodeRabbit

• Chores
  • Updated environment configuration structure with improved organization and standardized sections.
  • Revised API endpoint and documentation URL variable names and mappings for better clarity.
  • Reset placeholder credentials and tokens to empty values for cleaner local development setup.

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