rehype-remove-script-type-javascript: add example of `type="module"`

[j-f1]

Initial checklist

• [x] I read the support docs
• [x] I read the contributing guide
• [x] I agree to follow the code of conduct
• [x] I searched issues and couldn’t find anything (or linked relevant results below)
• [x] If applicable, I’ve added docs and tests

Description of changes

This adds a test (and an example in the README) to confirm that the type property of <script type="module">...</script> is preserved by rehype-remove-script-type-javascript. When reading through the README for this package, my immediate concern was that inline module scripts would be converted to regular scripts, so hopefully this change will assuage that concern for future visitors. Also, the test makes sure there won’t be a regression here.

[wooorm]

Thanks Jed!

[github-actions[bot]]

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