Tidy up requires/entrypoints/install docs

- Realized at this date that _moving_ Ed25519 deps behind an entrypoint
  is going the wrong direction, that key type should be used _more_ now,
  not _less_. I no longer even remember why folks were pissy about
  pynacl/bcrypt exactly.
- We can in fact just use ed25519 from cryptography itself now, so no
  more pynacl anyways (but still bcrypt)
- Twiddle install language a bit re: invoke used in more places, and
  again removing the notes about ed25519 being special

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