* Move tinymce to webpacker and upgrade to v6 [SCI-7081]
* Cleanup and refactor [SCI-7081]
* Clean up legacy plugins [SCI-7150]
* Linter fix [SCI-7081]]
* Also validate char count on paste in TinyMCE [SCI-6952]
* Fix new text tinymce init [SCI-6956]
* Fix step head styling [SCI-6952]
* Fix step dropdown icon [SCI-6948]