chore: cleanup example apps (#2408)

# Summary

* Restructure example apps to one entry-point in `./apps/index.tsx`
where we can change the import between `./examples` and
`./test-examples`
* update pod files

apps/examples/index.js

@@ -1,3 +0,0 @@
-import App from './App';
-
-export default App;

apps/index.tsx

@@ -0,0 +1,3 @@
+import App from './examples';
+
+export default App;

apps/test-examples/index.js

@@ -1,3 +0,0 @@
-import App from './App';
-
-export default App;