Remove django-tinymce from the requirements

requirements.txt

@@ -5,7 +5,6 @@ Django==2.2.25
 django-cors-headers==3.10.1
 django-environ==0.8.1
 django-oidc-provider==0.7.0
-django-tinymce==2.8.0
 django-versatileimagefield==1.11
 djangorestframework==3.13.1
 drf-nested-routers==0.93.4