Set devUrl from Bedrock's .env (if it exists)

[leek]

If Bedrock's .env file exists, we read it and set config.devUrl to the WP_HOME value from it. Otherwise, we continue as normal (using the value from manifest.json).

This will allow a seamless integration of Bedrock and Sage without compromising the flexibility of using Sage without Bedrock.

This is similar to #1640 but much simpler and is focused solely on using Sage with Bedrock (a common scenario, I assume).

[QWp6t]

We appreciate that you took the time to submit a PR, but unfortunately we can't accept this one.

1. We're not adding new features to Sage 8. Our focus is on Sage 9 at the moment.
2. Bedrock is switching over to INI. Switch from Dotenv/env file to an INI file bedrock#240

You can try resubmitting your PR to target Sage 9 if you'd like (along with a plan to migrate to INI parsing), where it can be discussed whether to add this feature. For the record, I'm personally against this. I don't think we should be sniffing around the file system anywhere outside of the sage directory.