[FR] Build for Android on Windows + Documentation update

[Xazin]

Description

We should update the documentation for building from source, the one for iOS links to a readme, it's not sustainable because somewhere in the future the file might be moved.

Also there is no documentation for Android, well there is also a readme, but we don't have it in docs.appflowy.io.

Additionally, seems the script for building Android is only supported on Linux and MacOS.

Impact

All documentation in one location, support developing on Android from Windows.

Additional Context

No response