Reorganize monorepo structure

* Move all config files to './configs'
* Simplify './scripts' folder.

scripts/createBabelReactNativeWebModuleMap.js

@@ -0,0 +1,24 @@
+/**
+ * Creates a map of exported modules, allowing the RNW babel plugin to rewrite
+ * paths only for modules it knows are exported by RNW.
+ */
+const fs = require('fs');
+const path = require('path');
+
+const isDirectory = (source) => fs.lstatSync(source).isDirectory();
+const getDirectories = (source) =>
+  fs.readdirSync(source).filter((name) => isDirectory(path.join(source, name)));
+
+const packagesDir = path.join(__dirname, '../packages/');
+const exportsDir = path.join(packagesDir, 'react-native-web/src/exports');
+const moduleMapOutfile = path.join(packagesDir, 'babel-plugin-react-native-web/src/moduleMap.js');
+
+const moduleMap = getDirectories(exportsDir).reduce((acc, curr) => {
+  acc[curr] = true;
+  return acc;
+}, {});
+
+const data = `// THIS FILE IS AUTOMATICALLY GENERATED. DO NOT EDIT.
+module.exports = ${JSON.stringify(moduleMap, null, 2)}`;
+
+fs.writeFileSync(moduleMapOutfile, data);