improvements

add book Manual de Devops

improve DevOps definition

improve headers gitops.md

Add gitops.md

fix gitops topic link on README.md

Create gitops.md

Add aditional topics on README.md

Update k8s.md

Update k8s.md

fix container engines on container.md

Improve k8s.md file to better understanding about runtime and engine

fix bullet point on container.md

fix mispelling on container.md

Update container.md