this should not change their behaviour with "nix run", which was
the reason for putting them there in the first place (however, it does
remove the ability to build them with "nix build", but afaik this has
never been used by anyone).
This means the packages.* output is now left unused, so we can use it
instead for things that actually are programs which want to expose
(see the next commit after this one for an example).
idea is to have a directory `websites/` which contains all our static
sites, with the name of each subdirectory also being their domain. Then
Nix can just read that directory during build-time and automatically
generate nginx virtualHosts for all of them (note that the
subdirectories have to contain a `default.nix` specifying how to build
the site for that to work).
Thus we could avoid the dependency on gitlab pages.
