delete demo app

[EvanBacon]

Motivation

• This was a quick example which now uses outdated code and is in the wrong repo, a better example is the tabs template.
• Favor new authentication guide https://github.com/expo/expo/pull/24185

[cameronelliott]

Evan, thank you for your work on this stuff. You said "better example is the tabs template" Could you point me to where the tabs template is?

I searched, but I'm new to expo. (expo/expo?) (expo/router?)

[cameronelliott]

I think I found it: https://github.com/expo/expo/tree/main/templates/expo-template-tabs