Fix relative link in contributing.md
When viewed on GitHub's web interface, the relative link was interpreted as relative to the current file path, leading to the incorrect URL "https://github.com/Rust-GPU/rust-gpu/blob/main/discussions" instead of the intended Discussions tab.
* examples/wgpu: Handle escape to exit (same as ash example)
* examples/wgpu: Set up for use on Android
* examples/wgpu: Convert #[cfg] blocks to cfg_if
* examples/wgpu: Wait for events instead of busy-looping
The image currently does not change and the OS will notify us when to
redraw (ie. after window resizes). This is going to save power
especially on mobile devices.
As soon as interactive or animating visuals are introduced to this
example redraws can be requested with `window.request_redraw()`.
* examples/wgpu: Create swapchain in ::Resume on Android
* docs: Add Android to supported operating systems
* ci: Build test cross-compilation for Android
* HACK: ci: Create Android symlink without spaces
* ci: Set legacy ANDROID_HOME because ndk-build prefers deprecated var
