fix: cli options behavior

[sashasushko]

We use commander.js for creating CLI. There is a strange behavior which more a bug than a feature.

When user makes a mistake and uses "-name" option instead "--name" commander is parsing it as "-n ame".

So, for the command

npx fontpie ./roboto-regular.ttf -name "Roboto"

our user gets

@font-face {
  font-family: 'ame';
               ^^^^^
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('examples/roboto-regular.ttf') format('truetype');
}

@font-face {
  font-family: 'ame Fallback';
               ^^^^^
  font-style: normal;
  font-weight: 400;
  src: local('Times New Roman');
  ascent-override: 84.57%;
  descent-override: 22.25%;
  line-gap-override: 0.00%;
  size-adjust: 109.71%;
}

html {
  font-family: 'ame', 'ame Fallback';
               ^^^^^
}

Acceptable fix

Show error to user in terminal and stop execution.

Ideal fix

Use font filename as font name in CSS and show notice to user in terminal.