Architect setup README bug

[miktap]

What version of Remix are you using?

1.2.3

Steps to Reproduce

Bug in "Architect Setup" README. It says:

You will be running two processes during development when using Architect as your server.

- Your Architect server sandbox in one
- The Remix development server in another

# in one tab
$ arc sandbox

# in another
$ npm run dev

But npm run dev runs both arc sandbox and remix watch in parallel. So it's enough to run just npm run dev.

Steps:

1. Create new Remix project (Architect)
2. Follow the README instructions

Expected Behavior

You have both architect and Remix server up and running.

Actual Behavior

npm run dev gives error:

Error: Port 3333 (http) is already in use, please select another with prefs.arc

As arc sandbox is already running.