Setup errors during build process (Update documentation)

[thimmayya]

Running either:
npm run build
or
npm run dev

Will throw an error when trying to compile the scss. This seams to be due to trying to import icons.scss when it's not properly generated yet. Running npm run fontello will generate needed files and let you continue with the installation/setup of the theme.

What about adding:
npm run fontello
As a requirement/step in the "Installation" step in the documentation?

[powerbuoy]

npm run fontello used to be part of both dev and build but I removed it without updating the docs. Will do!