* feat: replaced flaky argon2 with better argon2 crate
* fix: applied cargo fmt nightly
* docs: added comment specifying what the settings for Argon2 mean
* fix: made hashing error a bit more descriptive
* fix: fixed incorrect value for Kib
the ones now used by default in rust-argon2 are extremely aggressive and
resource intensive. owasp's 2nd default is very reasonable with the same
security.
Signed-off-by: girlbossceo <june@girlboss.ceo>