Reorganize monorepo structure

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

packages/react-native-web-examples/shared/example.js

@@ -0,0 +1,54 @@
+import { StyleSheet, Text, View } from 'react-native';
+
+export default function Example(props) {
+  return (
+    <View style={styles.root}>
+      <View style={styles.header}>
+        <Text accessibilityLabel="Back" href="/" style={styles.back}>
+          <svg
+            style={{ fill: '#555', height: '100%' }}
+            viewBox="0 0 140 140"
+            xmlns="http://www.w3.org/2000/svg"
+          >
+            <path d="M105.614 118.681c3.398 3.396 3.4 8.912 0 12.311-3.396 3.399-8.91 3.398-12.311 0-.02-.02-.035-.04-.053-.061l-.025.022-57.66-57.66.024-.022a8.664 8.664 0 01-2.608-6.208 8.672 8.672 0 013.229-6.762l-.06-.058 57.66-57.66.025.024c.018-.021.033-.039.053-.058A8.706 8.706 0 01106.2 14.86c-.021.02-.041.034-.061.054l.023.024-52.119 52.125 51.54 51.54-.025.021c.015.022.036.036.056.057" />
+          </svg>
+        </Text>
+        <Text accessibilityRole="heading" style={styles.title}>
+          {props.title}
+        </Text>
+      </View>
+      <View style={styles.container}>{props.children}</View>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  root: {
+    height: '100vh'
+  },
+  header: {
+    paddingVertical: '1em',
+    borderBottomColor: '#ccc',
+    borderBottomWidth: 1
+  },
+  title: {
+    fontSize: 18,
+    fontWeight: 'bold',
+    textAlign: 'center'
+  },
+  back: {
+    position: 'absolute',
+    height: '100%',
+    display: 'flex',
+    padding: 10,
+    left: 0,
+    top: 0,
+    width: 40,
+    alignItems: 'center'
+  },
+  container: {
+    alignItems: 'center',
+    flex: 1,
+    overflowY: 'scroll'
+  }
+});