Support md file in different directory?

If I have following tree structure:
/codes
|---src
|--- variables.tf
|---docs
|--- README.md

the recent change on entrypoint script prevents me from replacing section inside README.md.

Can we either revert to have the ENV_FILE environment variable or remove the call on `dirname` at
https://github.com/cytopia/docker-terraform-docs/blob/1bcddf68a9a760b2260a5f3248535ea7b90630fe/data/docker-entrypoint-0.12.sh#L108?

The later will allow me to mount /codes as /data, then set /data/src as current working directory. Then tf doc can be currently generated and output to docs/README.md:

`docker run --rm -it -v /codes:/data -w /data/src cytopia/docker-terraform-docs terraform-docs-replace md ../docs/README.md`