Consider using argparse-manpage to build the man page from argparse

[ericwb]

Is your feature request related to a problem? Please describe. A new way to avoid duplicate maintenance of the man page would be to take advantage of argparse-manpage to automatically build the man page doc by introspection of the use of the argparse function.

Describe the solution you'd like Get rid of the manually maintained doc/source/man/bandit.rst and replace with argparse-manpage to generate the manpage from argparse usage.

Describe alternatives you've considered n/a

Additional context https://github.com/praiskup/argparse-manpage

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