package dependency cleanup (#330)

* update npm packages.  babel 7, redux 4, etc

* remove obsolete babel config file

* use correct icons

client/configuration/webpack/webpack.config.dev.js

@@ -1,6 +1,5 @@
 // jshint esversion: 6
 const path = require("path");
-const autoprefixer = require("autoprefixer");
 const webpack = require("webpack");
 const HtmlWebpackPlugin = require("html-webpack-plugin");
 
@@ -39,12 +38,6 @@ module.exports = {
               importLoaders: 1,
               localIdentName: "[name]__[local]___[hash:base64:5]"
             }
-          },
-          {
-            loader: "postcss-loader",
-            options: {
-              plugins: () => []
-            }
           }
         ]
       },