refine docker usage documentation (#326)
refine docker usage documentation (#326)

docker has been available as native windows/macOS installation for about a year and is considered "stable"
bkimminich/juice-shop,bonze/juice-shop,bonze/juice-shop,m4l1c3/juice-shop,bkimminich/juice-shop,bkimminich/juice-shop,bkimminich/juice-shop,oviroman/disertatieiap2017,oviroman/disertatieiap2017,m4l1c3/juice-shop,bonze/juice-shop,bkimminich/juice-shop,m4l1c3/juice-shop,oviroman/disertatieiap2017,oviroman/disertatieiap2017,bkimminich/juice-shop,bonze/juice-shop,m4l1c3/juice-shop,oviroman/disertatieiap2017,bonze/juice-shop,m4l1c3/juice-shop