Version 1.0.0-alpha6

• Bug: docker-sync.yml missing from laravel env
• Bug: remove docker-sync command from start file
• Change: add info output related to docker-sync commands
• Change: composer container to official package
• Change: imporve the speed of ws:sites
• Bug: implement ask/validate & choices to question helper
• Change: make issue number optional in categorised commit
• Bug: fix incorrect answer returned from choices
• Change: remove silverstripe sake command as not used
• Change: use composer from php container instead of its container
• Misc: add experiment flag to ws:clone in readme