Update dev documentation around the `.env` file (how to setup project fork, PAT and `.env` local config)

[teolemon]

[VikramAditya33]

Hi! I'd like to work on this issue. Before I start, could you clarify:

1. Should I focus on the local development setup (which currently has no .env guidance)?

2. Any specific GitHub PAT permissions that should be documented?

3. Should this be a new section in setup-dev.md or updates to existing sections?

Thanks!

[vyshnaviTN]

Hi! I’d like to work on this issue.

I can start by reviewing the current local development and fork setup, then propose clear documentation for:

• project fork setup
• required GitHub PAT permissions
• .env local configuration

Please let me know if that approach works. Thanks!