Navigation through volume keys

[TheKoakuma]

Is your feature request related to a problem? Please describe.
Kinda, When i'm navigating one-handed it gets kinda stubborn sliding to navigate between posts

Describe the solution you'd like
Navigation through volume physical keys

[khoadng]

The app uses a cross-platform framework, making it difficult to implement platform-specific features. I won't add support for this unless there's a well-maintained package that handles hardware physical buttons.