move all expressions to nix/; include modularized home-manager config

pkgs/nomad/default.nix

@@ -1,29 +0,0 @@
-with import <nixpkgs> {};
-
-stdenv.mkDerivation rec {
-    name = "nomad";
-    version = "0.1.2";
-    filename = "nomad_${version}_linux_amd64.zip";
-
-    src = fetchurl {
-      url = "https://releases.hashicorp.com/nomad/${version}/${filename}";
-      sha256 = "0d3r3n1wwlic1kg3hgghds7f3b0qhh97v8xf36mcmsnmn2ngfd9k";
-    };
-
-    unpackPhase = ''
-      unzip ${src}
-    '';
-
-
-    buildInputs = [ makeWrapper unzip ];
-    libPath = lib.makeLibraryPath [ ];
-    installPhase = ''
-      patchelf --set-interpreter ${stdenv.glibc}/lib/ld-linux-x86-64.so.2 ./nomad
-
-      mkdir -p $out/bin
-      cp ./nomad $out/bin/nomad
-#      wrapProgram $out/bin/nomad \
-#        --prefix LD_LIBRARY_PATH : "${libPath}"
-#
-    '';
-}