Update sample app dependencies (#202)

* Use latest CRA in sample app
* Use latest upload widget

Author: Nir Maoz

samples/photo_album/.editorconfig

@@ -0,0 +1 @@
+SKIP_PREFLIGHT_CHECK=true

samples/photo_album/.env

@@ -1,7 +1,9 @@
-# See https://help.github.com/ignore-files/ for more about ignoring files.
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
 
 # dependencies
 /node_modules
+/.pnp
+.pnp.js
 
 # testing
 /coverage

samples/photo_album/.gitignore

@@ -18,16 +18,16 @@ There are 2 settings you need to change for this demo to work. Copy or rename `s
 
 ## Setup ##
 
-Run `npm install` to install the required dependencies for this module.
+Run `yarn` to install the required dependencies for this module.
 
 ## Running ##
 
-Run `npm start` to start the server and automatically open a browser and navigate to the application's url.
+Run `yarn start` to build the app and serve it using a local server.
 
-The application is deployed at http://localhost:3000/
+The application is deployed at http://localhost:5000/
 
 ## Internals ##
-This sample is using [Webpack](https://webpack.github.io) for bundling and serving the application.
+This sample was created using [CRA](https://github.com/facebook/create-react-app).
 
 ### Sample main components ###