New App Screen

[cpojer]

This is the list of remaining things to do before we can ship the new app screen (see react-native-community/discussions-and-proposals#122). The initial version of the code was landed via #24737:

• Fix up the styling and color names a bit more.
• Split up the components the way @orta proposed so we'll have some good sample code in the App.js template.
• Make it so that links tapped will send an open-in-browser command via Metro on the host instead of in the emulator. See https://github.com/react-native-community/cli/blob/885f2c28d4e8ed66e334fd7bd0174173b2a394e1/packages/cli/src/commands/server/middleware/openStackFrameInEditorMiddleware.js for how we are doing this in the cli/metro (this may need some changes to the CLI and Metro) and https://github.com/facebook/react-native/blob/1151c096dab17e5d9a6ac05b61aacecd4305f3db/Libraries/Core/Devtools/openFileInEditor.js (@lucasbento)
• Add a "Follow us on Twitter" button 😄
• Actually put this all in the template so it can be shipped as part of 0.61.

cc @eliperkins @lucasbento would be awesome if you could help out! :)

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[lucasbento]

I would love to help on this, specially the opening links on the browser part.

Would this be targeting 0.61? I'm currently busy with some stuff for the CLI but I would probably be able to do some stuff for this next week.

[cpojer]

Yep, 0.61. Ideally we'll wrap this work up by the end of the month.

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