Removed unused sphinx dependency in requirements now we use a separate container

api/requirements/local.txt

@@ -2,7 +2,6 @@
 
 coverage>=4.4,<4.5
 django_coverage_plugin>=1.5,<1.6
-Sphinx>=1.6,<1.7
 factory_boy>=2.8.1
 
 # django-debug-toolbar that works with Django 1.5+