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.

openflexure_microscope/api/app.py

@@ -218,10 +218,14 @@ def cleanup():
 
 atexit.register(cleanup)
 
-# Start the app
-if __name__ == "__main__":
+def ofm_serve():
+    # Start a debug server
     from labthings import Server
 
     logging.info("Starting OpenFlexure Microscope Server...")
     server: Server = Server(app)
     server.run(host="0.0.0.0", port=5000, debug=debug_app, zeroconf=True)
+
+# Start the app if the module is run directly
+if __name__ == "__main__":
+    ofm_serve()