move next and expo into an apps folder for better mono repo structure

[dohomi]

As all turbo repo starter packages showcase the best practice would be to move expo and next folder into an "apps" folder as a starting point of a monorepo

[dohomi]

The docs also mention the apps folder so it might be confusing for people who are new to monorepos. https://tamagui.dev/docs/guides/create-tamagui-app