* gdouros-fonts: fix build
some hashes were changed since ods files are now installed
* camingo-code: fix build
contents not changed
* hannom: fix build
* helvetica-neue-lt-std: fix build
perms changed so the hash changed too
* liberastika: fix build
hash changed due to no doc dir anymore
* kochi-substitute-naga10: fix build
* xkcd-font: use a simpler method to remove unneeded files
* fonts: also remove hidden files
* make font derivations fixed-output where applicable
* fix dead links
* `stdenv.lib` -> `lib` where `stdenv` is not involved
* remove `meta.platforms = [ unix ]` and `meta.platforms = [ linux ]` because the restriction has no sense for data packages
