Update .deployignore to exclude unnecessary files

[Eduardo-Batist4]

This PR updates the .deployignore file to prevent deployment of development, config, and test files, as described in issue #162.
Fixes #162

[kevinfodness]

Thanks for your contribution! You're on the right track, but the paths need to be modified as follows:

1. Root paths should be prefixed with a /, for example /.editorconfig
2. Plugin paths should be prefixed with the default path to the plugin, which is /plugins/create-wordpress-plugin/, for example /plugins/create-wordpress-plugin/blocks
3. Theme paths should be prefixed with the default path to the theme, which is /themes/create-wordpress-theme/, for example /themes/create-wordpress-theme/entries

Once those changes have been made, let me know, and I'll re-review.