Separate dev and prod requirements

requirements/common.txt

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+# Contains requirements common to all environments
+
+# Engine
+Django==3.1.6
+Pillow==8.1.0
+zenpy~=2.0.24
+django_registration==3.1.1
+djangorestframework==3.12.2
+
+
+# Documentation
+Sphinx==3.4.3
+sphinx-rtd-theme==0.5.1
+sphinx-autodoc-typehints==1.11.1
+pyenchant==3.2.0
+sphinxcontrib-spelling==7.1.0

requirements/dev.txt

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+# Development specific dependencies
+-r common.txt
+

requirements/prod.txt

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+# Production specific dependencies
+-r common.txt
+
+daphne==3.0.1
+Twisted[tls,http2]==21.2.0