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Summary
This removes the deprecation.py that was created some time ago to provide deprecation decorators for the apps. Recently the Qiskit decorators have been overhauled and improved, plus the automatically add deprecation info to the docs. Going forwards the Qiskit decorators should be used for deprecations - Nature even had an issue qiskit-community/qiskit-nature#1196 to switch usage. Given there is no deprecated code here now, so with the module being unused its a good time to remove it - it is being done in Nature here qiskit-community/qiskit-nature#1248 (which removes deprecated code there) which prompted me to do it here.
Since that was just used by developers on the code here, and is not part of public API, no reno is needed.
Details and comments