[docs] update Next and Styleguide packages to the latest version (#22274)

[docs] fix AppJS button hover style (#21701)

[docs] Adds AppJS banner (#21619)

# Why

I talked with Paulina about adding an App.js banner, to advertise it to
Expo docs readers.

# How

- Adds the same component we had last year, but wit

[docs] Adds AppJS banner (#21619)

# Why

I talked with Paulina about adding an App.js banner, to advertise it to
Expo docs readers.

# How

- Adds the same component we had last year, but with updated information
- Adds the banner on the home page above the current content

# Screenshot

<img width="1348" alt="Screenshot 2023-03-08 at 11 31 11 AM"
src="https://user-images.githubusercontent.com/6455018/223787161-f262d347-31f6-4f59-a1b5-2288e951e252.png">


# Test Plan

Make sure that the banner appears as it does in the screenshot above.

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