link to nur-packages repo on nur.nix-community.org user page

[milahu]

for example on http://nur.nix-community.org/repos/milahu/

add a link to https://github.com/milahu/nur-packages

the link could be placed below the packages table
something like ...

The package list was generated from github.com/milahu/nur-packages

[Mic92]

cc @mipmip