Remove references to depreciated QasmSimulator (#7417)

* Fix typos

* Replace depreciated QasmSimulator in Deutsch-Jozsa algorithm

* Replace depreciated QasmSimulator in half adder algorithm

* Replace depreciated QasmSimulator in not gate algorithm

* Replace depreciated QasmSimulator in full adder algorithm

* Simplify qiskit import

* Make formatting more consistent

* Replace depreciated QasmSimulator in quantum entanglement algorithm

* Replace depreciated QasmSimulator in ripple adder algorithm

* Replace depreciated QasmSimulator in qubit measure algorithm

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* updating DIRECTORY.md

* updating DIRECTORY.md

* Remove qiskit import alias for clarity

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