Move away from poetry

More or less everything is now done by setup.py
Pipfile simply installs the module in editable mode, which
recursively resolves dependencies as defined in setup.py.

Pipfile

@@ -0,0 +1,20 @@
+[[source]]
+url = "https://pypi.python.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[[source]]
+url = "https://www.piwheels.org/simple"
+verify_ssl = true
+name = "piwheels"
+
+[requires]
+python_version = '3.7'
+
+[packages]
+#openflexure-microscope-server = {path = "."}
+#TODO: decide if we want dev dependencies here or in setup.py
+openflexure-microscope-server = {editable = true, path = "."}
+
+[dev-packages]
+#openflexure-microscope-server = {path = ".", editable=true, extras=["dev"]}