Add an updated deprecation notice directing to Acorn #418
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Updates the README.md to point to Mozilla's current design system, instead of a generic deprecation notice. When searching for Mozilla's design system, this repository is likely to come up, so this change would be helpful to those looking for Acorn. Wording is modified slightly from https://acorn.firefox.com/latest/f-a-q-g56QlqB6: