https://ckeditor.com/docs/ckeditor5/latest/builds/guides/development/custom-builds.html
<?php
echo $asdfasdf;
?>
git clone -b stable https://github.com/tonylabs/ckeditor5-build-classic.git
npm install
npm install --save @ckeditor/ckeditor5-alignment
npm install --save @ckeditor/ckeditor5-autosave
npm install --save @ckeditor/ckeditor5-highlight
npm install --save @ckeditor/ckeditor5-remove-format
yarn run build