App Bug update 2.0.1

[ovbm]

fixes #249, fixes #250, fixes #207, fixes #248, fixes #247, fixes #246, fixes #241, fixes #240

[ovbm]

@tpreusse A lot of the file changes are due to the react-native upgrade. most relevant for review:

• android/app/src/main/AndroidManifest.xml (chromebook)
• android/app/src/main/res/values/colors.xml & styles.xml (scrollbar color)
• ios/republikapp/AppDelegate.m (root background color black as default)
• src/services/DeepLinking.js (tewak on the Linking.getInitialURL fix, due to RN 0.64 filename changes)

I was able to build and run the app on both ios simulator and android simulators. Would be good to make a test flight version. I'm currently blocked because of a weird node-related bug, which prevents me from building the ios bundle with the command line (only works via xcode, see: https://github.com/facebook/react-native/issues/31259 for details). Was able to fix the issue (it seems to be a local node issue)

[ovbm]

Tested fullscreen video and gallery. Working as intended on my device.

ScrollBars:

[ovbm]

Linking needs to be tested more, agreed

[ovbm]

Deep linking works perfectly :), will merge and release as there hasn't been any reported issues.