Add wp-env support

[kraftbj]

It was helpful when testing my previous PR to test it out locally and wp-env was nice and simple. The AP plugin prefers a pretty permalink setting, so this adds wp-env as a "supported" local setup, including auto-setting the permalink when using npm run env-start

Proposed changes:

• Adds .wp-env.json file.
• Adds script to package.json to start and stop the env.

Other information:

• Have you written new tests for your changes, if applicable?

Testing instructions:

• npm install && npm run env-start does it work? Open the site (default user/pass: admin/password). Are permalinks already set?"
• npm run env-stop does it stop?

[kraftbj]

We can probably chain things with npm run dev to auto-start the env too, but I defer to y'all who work on this daily on that one.

[kraftbj]

I also alpha-sorted .distignore just for the sake of my own brain being able to parse the list faster.

[pfefferle]

thanks @kraftbj