Cleanup showcase with outdated users

[ginnyTheCat]

Inspired by this videos I verified its claims for all the Android apps (i do not have access to a apple device at the moment to verify this on iOS).

• Facebook iOS, uses a different framework according to a official blogpost.
• Amazon Appstore, deprecated
• Walmart, Pinterest and Tencent QQ, verified by me on Android to not use React Native, iOS claim from video seems believable
• Words with Friends 2, verified to use Unity on Android, unlikely to have a seperate iOS codebase
• Call of Duty Companion App, doesn't exist anymore

I marked some other popular apps as pinned to keep the 5x5 grid on the Home page.

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[ginnyTheCat]

Closing in favor of #4605