Merge pull request #12 from tencent-quantum-lab/master

take the classical shadow tutorial out

Author: PeilinZHENG

docs/source/tutorial.rst

@@ -25,6 +25,5 @@ Jupyter Tutorials
     tutorials/barren_plateaus.ipynb
     tutorials/qaoa_portfolio_optimization.ipynb
     tutorials/imag_time_evo.ipynb
-    tutorials/classical_shadows.ipynb
     tutorials/sklearn_svc.ipynb
     tutorials/qcloud_sdk_demo.ipynb