Documentation uses `config-sync` command before adding it

[Helveg]

Bug report

Describe the bug

When following the README, npm run config-sync export is used before instructions appear to add it to package.json, and I had this error:

PS D:\GIT\hub-cms> npm run config-sync export
npm ERR! Missing script: "config-sync"
npm ERR!
npm ERR! To see a list of scripts, run:
npm ERR!   npm run

It was not available through npm run:

PS D:\GIT\hub-cms> npm run
Lifecycle scripts included in XXX:
  start
    strapi start

available via `npm run-script`:
  develop
    strapi develop
  build
    strapi build
  strapi
    strapi

Expected behavior

Be able to follow the README step by step. Instruct the user to add the command (either as cs or config-sync which should then always be used as such in the rest of the docs)

[boazpoolman]

I've just pushed the README change to github.
Thanks for the pointer :)