feat(main): Add base theme: This is the falcon theme out of the box.

This is falcon v3.1.2

falcon/_dev/webpack.config.js

@@ -0,0 +1,18 @@
+const { webpackVars, getEnvData } = require('./webpack/webpack.vars.js');
+const { commonConfig } = require('./webpack/webpack.common.js');
+const { productionConfig } = require('./webpack/webpack.production.js');
+const { developmentConfig } = require('./webpack/webpack.development.js');
+const { merge } = require('webpack-merge');
+
+const getConfig = ({mode, ...vars}) => {
+  switch (mode) {
+    case 'production':
+      return merge(commonConfig({mode, ...vars}), productionConfig({mode, ...vars}));
+    case 'development':
+      return merge(commonConfig({mode, ...vars}), developmentConfig({mode, ...vars}));
+    default:
+      throw new Error(`Trying to use an unknown mode, ${mode}`);
+  }
+};
+
+module.exports = (env, options) => getEnvData({env, options, webpackVars}, getConfig);