Create a guide for Dev vs Staging vs Production

[pratikjagrut]

Is your feature request related to a problem? No

Which solution do you suggest? https://www.devspace.sh/docs/5.x/guides/dev-staging-production

Additional context Users may want to use devspace for different environments such as Dev, Staging and Production. We had a guide for this in our older version, we should add one similar guide for v6.