docs: Swapping out references of ES format to ESM

[rschristian]

Summary

Addresses the footer of #775 (comment)

Replaces "es" in the output formats section of the ReadMe + CLI's help with "esm". The format is otherwise always referred to as "ESM" or "ES Modules" so I agree that's a fair change to make.

Note: There's a few unrelated changes caused by the prettier pre-commit hook. I'd normally revert the unrelated changes but I figure the hook is there to be used.

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[developit]

LGTM! We have these aliased anyway so its nice to standardize. I believe Rollup also allows both, though they have es as the default.

[rschristian]

Ah, that makes sense! I noticed that esm gets converted to es after checking that both were supported but wasn't sure of the reason for it.