fix: correct paremeters and directories when calling keygen

[dd23]

Fixed an issue with outdated CLI agruments when calling kms core keygen.

Also updates a few minor things in the README.

[fd0r]

Looks good to me!

With KEY_GEN=true in .env the tests are now passing.

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[jot2re]

Looks good to me! But I didn't test yet.
I found a missing update to a comment which I added. I also added a couple of updates to the readme file

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[aquint-zama]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!