Remove unnecessary type attribute from <style> and <script>

[zcorpan]

The attributes are obsolete and are generating warnings in validator.w3.org/nu as per https://html.spec.whatwg.org/multipage/obsolete.html#warnings-for-obsolete-but-conforming-features

This is similar to speced/bikeshed-boilerplate#16

[tabatkins]

You need to regen the tests alongside this; run bikeshed test --rebase.

[tabatkins]

Tho, since the built-in boilerplates are dramatically out of date at this point anyway, just fixing this issue will be putting a bandaid on a bullet wound. So nm, I'll just go ahead and close; I've been wanting to do a readonly update for a while, it just requires a lot of boring verification that everything's still as expected.