Update README.rst (quantumlib#3425)

Updated links for Installation and Tutorial.

README.rst

@@ -28,9 +28,9 @@ Documentation for the latest **unstable** version of cirq (tracks the repository
 Documentation for the latest **stable** version of cirq (what you get if you ``pip install cirq``) is available at `cirq.readthedocs.io/stable <https://cirq.readthedocs.io/en/stable/>`_.
 
 
-- `Installation <https://cirq.readthedocs.io/en/stable/install.html>`_
+- `Installation <https://cirq.readthedocs.io/en/stable/docs/install.html>`_
 - `Documentation <https://cirq.readthedocs.io>`_
-- `Tutorial <https://cirq.readthedocs.io/en/stable/tutorial.html>`_
+- `Tutorial <https://cirq.readthedocs.io/en/stable/docs/tutorials/basics.html>`_
 
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