Update documentation

[Drsheppard01]

Can you update documentation how to build AppImage v3 with static tools, runtime and other things for non-glibc system like @chimera-linux

[probonopd]

There is no "AppImage v3". If you use appimagetool from https://github.com/AppImage/appimagetool/releases rather than from https://github.com/AppImage/AppImageKit/releases, then you will get the static runtime.

Some higher-level tools (such as linuxdeployqt) use appimagetool internally; those tools will need to be updated to use the new appimagetool.

However, if you want to create an AppImage that can run on non-glibc systems (or build the ingredients for an AppImage on a non-glibc system), then you need to bundle everything inside the AppImage. Tools like go-appimage's appimagetool can do that.