Update the website to reflect experimental➡️preview change #4701
Description
This includes docs, live demos, etc. and I think it could be done by a designer or a dev. It's a fairly straightforward change I believe
As of Sept 18 2025 there's 26 occurrences across 16 .mdx files. It probably can't be a blind find all and replace, there's dev-based usages that we may want or need to keep.
This is probably best for a dev to tackle and then validate all changes with a designer during PR review.