Bugfix/djangocms text ckeditor 568 from 590 (#541)

* fix(django): implement djangocms-text-ckeditor#568

Implement the #568 fix from PR #590 until we update our ckeditor to v5.

This will save H.P. (main CMS admin/designer) so many tiny bits of time.

* fix(django): working remote url for remote css

Fixes: #540

* fix: delete unrelated file added during merge

taccsite_cms/static/djangocms_text_ckeditor/css/cms.ckeditor.css

@@ -1,6 +1,6 @@
 /* IMPORTANT: Unnecessary if we use djangocms-text-ckeditor@5.0.0 */
 
-@import url("https://raw.githubusercontent.com/django-cms/djangocms-text-ckeditor/3.10.0/djangocms_text_ckeditor/static/djangocms_text_ckeditor/css/cms.ckeditor.css");
+@import url("https://combinatronics.com/django-cms/djangocms-text-ckeditor/3.10.0/djangocms_text_ckeditor/static/djangocms_text_ckeditor/css/cms.ckeditor.css");
 
 /* https://github.com/django-cms/djangocms-text-ckeditor/pull/590 */
 textarea.cke_source { max-height: inherit; }