Update suggestions for https://data-workspace.docs.trade.gov.uk/development/

[AlasdairGray]

In order to get the service running for the first time, you need to follow the steps about 'Front end static assets' and 'React apps' before the Docker build will complete successfully.

I'd suggest that the the instructions on https://data-workspace.docs.trade.gov.uk/development/ are updated to reflect these steps need to be done first.