chore: remove unused .distignore

It can always be re-added at a later date if it becomes useful.

.distignore

@@ -1,33 +0,0 @@
-# A set of files you probably don't want in your WordPress.org distribution
-
-.distignore
-.editorconfig
-.git
-.gitignore
-.gitlab-ci.yml
-.travis.yml
-.DS_Store
-Thumbs.db
-behat.yml
-bin
-circle.yml
-composer.json
-composer.lock
-Gruntfile.js
-package.json
-phpunit.xml
-phpunit.xml.dist
-multisite.xml
-multisite.xml.dist
-phpcs.ruleset.xml
-LICENSE
-wp-cli.local.yml
-tests
-vendor
-node_modules
-*.sql
-*.tar.gz
-*.zip
-authors.txt
-composer.*
-.php-commitizen.php