gluestack-ui migration modal shows up every time page is opened

[justinmwarner]

Having the modal is really useful, however, every time I load the docs page, it shows up even though I've dismissed it many times in the past. Given the large change needed to migrate, I can't use the new UI for the foreseeable future and will be using native-base for a bit longer. I'm no longer getting value from this modal, so having it pop up every time is adding more time / effort to my work.

Can we instead have this modal driven by some localstorage value? The MessageBar on every page should be enough to remind users that this migration will be needed in the future (heck, you could even color it more yellow so that it's more eye-catching).