Start entire app using npm start (#26)

Start entire app using `npm start`

Author: swyxio

README.md

@@ -20,6 +20,18 @@ All functions are compiled with webpack using the Babel Loader, so you can use m
 
 Before developing, clone the repository and run `yarn` from the root of the repo to install all dependencies.
 
+### Start both servers concurrently
+
+From inside the project folder, run:
+
+```
+yarn start
+```
+
+This will run both `yarn start:lambda` and `yarn start:app` at the same time (more information about the commands can be found below).
+
+> Note: You don't need this if you use [`netlify dev`](https://github.com/netlify/netlify-dev-plugin/) as [function builder detection](https://www.netlify.com/blog/2019/04/24/zero-config-yet-technology-agnostic-how-netlify-dev-detectors-work/) does that for you.
+
 ### Start each server individually
 
 **Run the functions dev server**
@@ -46,8 +58,6 @@ This will start the normal create-react-app dev server and open your app at `htt
 
 Local in-app requests to the relative path `/.netlify/functions/*` will automatically be proxied to the local functions dev server.
 
-> Note: You can also use [npm-run-all](https://github.com/mysticatea/npm-run-all#readme) to run the functions dev server and app dev server concurrently. Note that you don't need this if you use [`netlify dev`](https://github.com/netlify/netlify-dev-plugin/) as [function builder detection](https://www.netlify.com/blog/2019/04/24/zero-config-yet-technology-agnostic-how-netlify-dev-detectors-work/) does that for you.
-
 ## Typescript
 
 <details>