Add make target to deploy to Firebase

The configuration file has been split into 2: one for development mode
and another one for production mode.

Change-Id: I12917cd79c95642adc30004be5bc1a927bca389b
diff --git a/frontend/webpack.config.js b/frontend/webpack.config.js
index 7287e6c..005f361 100644
--- a/frontend/webpack.config.js
+++ b/frontend/webpack.config.js
@@ -1,3 +1,4 @@
+const webpack = require('webpack');
 const path = require('path')
 const json5 = require('json5');
 const {VueLoaderPlugin} = require('vue-loader');
@@ -47,6 +48,9 @@
         filename: 'index.html',
         template: 'index.html',
       }),
+      new webpack.DefinePlugin({
+        'PRODUCTION': args.mode == 'production',
+      }),
     ],
     devServer: {
       static: './dist',