[4.1.2] Removed Qiskit Aqua references

[Ryand1234]

fixes #1331

Changes made

removed Qiskit aqua references

Justification

removed qiskit-aqua references from the code and related text which is being deprecated.

[Ryand1234]

@frankharkins I am not getting this error, Its working fine for me. But I am getting

QiskitChemistryError: 'PySCF is not installed. See https://sunqm.github.io/pyscf/install.html'

error. I tried installing PySCF but its not installing.

[divshacker]

@frankharkins I am not getting this error, Its working fine for me. But I am getting

QiskitChemistryError: 'PySCF is not installed. See https://sunqm.github.io/pyscf/install.html'

error. I tried installing PySCF but its not installing.

Hey, you are not facing any errors because you haven't updated the Qiskit version. Can you show your version info?

[divshacker]

Here is mine, Verify if it matches with your system by running this.

import qiskit.tools.jupyter
%qiskit_version_table

Version Information

Qiskit Software	Version
qiskit-terra	0.19.1
qiskit-aer	0.10.1
qiskit-ignis	0.7.0
qiskit-ibmq-provider	0.18.3
qiskit-aqua	0.9.5
qiskit	0.34.0
qiskit-nature	0.3.0
qiskit-finance	0.3.0
qiskit-optimization	0.3.0
qiskit-machine-learning	0.3.0

[frankharkins]

Thanks for your contribution. I'm closing this pull request as this repository is no longer used and is being archived. You can find the latest version of the Qiskit Textbook online at https://qiskit.org/learn/, and the new content repository at Qiskit/textbook. Please feel free to re-open this pull request there if it's still relevant.