This commit includes a bunch of minor updates of some Nix modules but
the focus here is the update of the theme template. The renaming of the
Cookiecutter template will now make backups and migration between
different filesystems very easy especially with NTFS-based filesystems
often found on external hard drives.
I also fixed the long-time occuring error when using the newest version
of the channel (or the unstable one). It turns out to be a simple type
error with the `my.user' attribute. (To be honest the error messages are
quite horrible.)
On another note, I also accidentally bricked my NixOS setup after a
garbage collection and a horrible update. The breakage includes not
being able to use any of the builtin tools of Nix (e.g., nix, nix-env,
nixos-rebuild) due to a shared library error that has been garbage
collected. Which means I have to reinstall it.
(I seem to have a talent for breaking things, if only I'm paid for it.)
One of the bigger changes is to make the setup hardware-independent
which is nice for easier (re-)installations.
Finally about time it happens.
Another big thing is the update of the README, now with some
self-reminding pitch why choose NixOS (or something similar like GuixSD)
which could be nice for other people too, provided they've come across
my NixOS config.
I made the module docstrings a bit more consistent (though still
useless, to be honest).
I've also updated config for Visual Studio Code.
