Update test_transpiler.py

import BackendV2 from qiskit.providers.beckend

Update test_spin_circuit_solver.py

Update test_ffsim_backend.py

Update test_fermionic_basis.py

Update test_fermion_state.py

Update base_fermion_backend.py

Update fermionic_state.py

Update test_fermion_circuit_solver.py

Remove qiskit.org links (qiskit-community#95)

Remove qiskit.org links (qiskit-community#95)

Add ffsim simulator backend (qiskit-community#90)

Fix documentation problems (qiskit-community#86)

Fix docs templates (qiskit-community#84)

Replace numpy.alltrue with numpy.all (qiskit-community#76)

revert to numpy>=1.17 in requirements.txt

add release notes for PR qiskit-community#76

unpin numpy version in requirements.txt

substitute alltrue with all in test_spin_circuit_solver.py

substitute alltrue with all in test_fermion_circuit_solver.py

Upgrade to qiskit_sphinx_theme 1.12 (qiskit-community#71)