Initial stab at setting up the documentation

docs/Makefile

docs/conf.py

docs/index.rst

docs/make.bat

docs/source/capability.rst

docs/source/channels.rst

docs/source/modules.rst

docs/source/null.rst

docs/source/schema.rst

docs/source/support.rst

docs/source/vulture.rst

docs/source/wf_monitor.rst

docs/source/workflow.rst

docs/source/workspaces.rst