Changed error message of deploy apps to be more descriptive

[ahmad-reza619]

Related Issue

close #685

Your solution

I have changed the error message of webiny deploy-apps to be more descriptive so that it's a little bit more descriptive

How Has This Been Tested?

1. run webiny deploy-apps --env=dev with prerequisites of not having dev environment .env.json files in apps
2. there will be an error saying

Environment {name of environment} is missing {app path}/.env.json file.
Have you deployed the corresponding API environment?
To deploy the API, run "webiny deploy-api --env=dev."

Screenshots (if relevant):

[Pavel910]

Thanks for your PR! I've added some minor change requests :)

[Pavel910]

Looks good! Thank you for your time and congratulations on your first PR! 🎉

[ahmad-reza619]

Looks good! Thank you for your time and congratulations on your first PR! 🎉

Sweet! Thank you too for all of your help 😄 glad i can be help