added webpack dev server, slightly improved ui and render preview

configs/webpack.renderer.prod.config.babel.js

@@ -0,0 +1,11 @@
+import baseConfig from "./webpack.base.config.js";
+import {merge} from 'webpack-merge';
+
+export default merge(baseConfig, {
+  mode: 'production',
+  target: 'electron-renderer',
+  entry: './src/renderer.tsx',
+  output: {
+    filename: 'renderer.js'
+  },
+});