Update tutorial links on readme (#3609)
Update tutorial links on readme (#3609)

the tutorial link was prefixed with https://https://. This update fixes the link issue
quantumlib/Cirq,quantumlib/Cirq,balopat/Cirq,quantumlib/Cirq,quantumlib/Cirq,balopat/Cirq,quantumlib/Cirq,balopat/Cirq