Get Started page does not scrub/strip worker name field

[indyramp]

The "worker name" field in the Get Started command builder does not check for valid worker names. This means spaces, punctuation, and potentially other things could get in there.

The field should scrub anything that is not a letter, number, underscore, or hyphen.

In the event that any other characters are valid, the miner should be able to manually adjust, but we should not allow spaces, emojis, shell characters (for linux miners), or other invalid characters.