docs(README): update environment configuration details

Author: mrz1836

README.md

@@ -247,7 +247,7 @@ go install github.com/mrz1836/go-pre-commit/cmd/go-pre-commit@latest
 go-pre-commit install
 ```
 
-The system is configured via [.env.base](.github/.env.base) and can be customized using also using [.env.custom](.github/.env.custom) and provides 17x faster execution than traditional Python-based pre-commit hooks. See the [complete documentation](http://github.com/mrz1836/go-pre-commit) for details.
+The system is configured via modular env files in [`.github/env/`](.github/env/README.md) and provides 17x faster execution than traditional Python-based pre-commit hooks. See the [complete documentation](http://github.com/mrz1836/go-pre-commit) for details.
 
 </details>