websites - add pagefind.app support

[cscheid]

pagefind is an alternative content search library to fusejs, and offers a bit more customizability. It should also be significantly faster and more resource-efficient than fusejs.

To be done:

• changelog entry (we don't have a 1.10 file)
• documentation

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[cscheid]

This would work if we didn't try and bundle the JS, but the bundler has a failure we can't easily work around, sadly.