add .dockerignore, add Dockerfile, add default.nix, udpate README.md, move packages into respective category(dev/production)

default.nix

@@ -0,0 +1,21 @@
+with import <nixpkgs> {};
+with pkgs.yarn;
+
+stdenv.mkDerivation {
+  name = "yarn";
+  buildInputs = [
+    nodejs-10_x
+    (yarn.override { nodejs = nodejs-10_x; })
+    mozjpeg
+    optipng
+    autoconf
+    automake];
+  src = null;
+  shellHook = ''
+    unset http_proxy
+    export GIT_SSL_CAINFO=/etc/ssl/certs/ca-bundle.crt
+    SOURCE_DATE_EPOCH=$(date +%s)
+    zsh
+  '';
+}
+