added Welcome page

changed settings API and page to React + rest
changed structure of scripts - different folders for editor and admin scripts

webpack.config.js

@@ -1,9 +1,19 @@
+/**
+ * External Dependencies
+ */
+const { resolve } = require('path');
 const defaultConfig = require('@wordpress/scripts/config/webpack.config');
 
 const isProduction = process.env.NODE_ENV === 'production';
 
 const newConfig = {
 	...defaultConfig,
+	...{
+		entry: {
+			admin: resolve(process.cwd(), 'src/admin', 'index.js'),
+			editor: resolve(process.cwd(), 'src/editor', 'index.js'),
+		},
+	},
 
 	// Display minimum info in terminal.
 	stats: 'minimal',