docs: add note on checkbox.md about needed input:hidden

[manicar2093]

Close #1170

Documentation was not clear about using an input:hidden to make checkbox component work. This PR adds a note in page to do more clear this step

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Latest commit: 0d3a7e2

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[manicar2093]

This PR is related to PR #1178 I hope is useful

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[manicar2093]

Hi, @huntabyte. Do you need me to do something with this lint error? 😃

[huntabyte]

No, we should be ignoring those for linting tbh. Will fix soon.

[manicar2093]

Cool! If you need something I’ll be here 🥳