Added support environment variables

[ezrasingh]

What type of PR is this? (check all applicable)

• Refactor
• Feature
• Bug Fix
• Optimization
• Documentation Update

Description

Key Changes

• Environment Variable Documentation: Added detailed explanations of the environment variables GEOPROX_CONFIG, GEOPROX_HTTP_ADDR, and GEOPROX_HTTP_PORT in the documentation, highlighting their default values and usage.
• Environment Variable Precedence: Clarified that environment variables take precedence over configuration files, ensuring users understand the order of operations when both are present.

Related Tickets & Documents

• Related Issue Missing Docs On Environment Variables #6
• Closes Missing Docs On Environment Variables #6

QA Instructions, Screenshots, Recordings

• Verify that the environment variables are correctly documented in the project's documentation.
• Test the behavior by setting the environment variables and observing that they override the values in the configuration files as expected.

Added/updated tests?

• Yes
• No, and this is why: Documentation changes do not require additional tests.
• I need help with writing tests