Add WP CLI apache modules

[martynmjones]

Changes proposed in this Pull Request:

Closes #2044

Adds a wp-cli.yml file containing mod_rewrite so that a .htaccess file can be generated when the permalinks are updated during wp-env setup.

Detailed test instructions:

1. Checkout fix/add-wp-cli-config-file
2. With docker running
3. npm i && npm run wp-env start
4. Visit http://localhost:8889/shop and confirm that the page loads

Additional details:

See: https://developer.wordpress.org/cli/commands/rewrite/structure/

Changelog entry

Tweak - Add configuration file for wp-env

[martynmjones]

Jumped the gun after using wp-env for compatibility testing but this has been addressed #2041 so closing this PR and issue.