- Begin a new chapter "GPU Acceleration", this should also cover VA-API, OpenGL, Vulkan, etc. - Add a general blurb about OpenCL and how to check whether OpenCL devices are found. - Add a section about enabling OpenCL for AMD GPUs specifically.
To build the manual, you need Nix installed on your system (no need
for NixOS). To install Nix, follow the instructions at
    https://nixos.org/nix/download.html
When you have Nix on your system, in the root directory of the project
(i.e., `nixpkgs`), run:
    nix-build nixos/release.nix -A manual.x86_64-linux
When this command successfully finishes, it will tell you where the
manual got generated.