Remove .ddev and .gitignore from repository

This module uses the https://github.com/ddev/ddev-drupal-contrib approach for module development. This makes the module easy to maintain. Drupal CMS also has a committed `.ddev` directory although their setup isn't for a contrib module: https://git.drupalcode.org/project/drupal_cms

Looks like there are over 60 projects on d.o using this approach now.

Added: https://git.drupalcode.org/project/me_language_visibility

Automatically closed - issue fixed for 2 weeks with no activity.