[maintain-harbor] use click
- use click instead of argparse
- move example config from README to it's own file
- minor refactoring
Bug: T353059
Signed-off-by: Ndibe Raymond Olisaemeka rolisaemeka-ctr@wikimedia.org
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Bug: T353059
Signed-off-by: Ndibe Raymond Olisaemeka rolisaemeka-ctr@wikimedia.org