Switch to create-expo-app + blank-typescript, remove .npmrc cmds

[karlhorky]

Switch from create-expo to create-expo-app, because the Expo docs use this:

• https://docs.expo.dev/get-started/create-a-project/
• https://docs.expo.dev/more/create-expo/

Also switch from the blank template to blank-typescript, because we teach Expo with TypeScript