improve doc image demo

Author: ericogr

README.md

@@ -1,8 +1,7 @@
 # K8S Object Template Operator [![CircleCI](https://circleci.com/gh/ericogr/k8s-object-template-operator.svg?style=svg)](https://circleci.com/gh/ericogr/k8s-object-template-operator)
 This operator can be used to create any kubernetes object dynamically. Build your own templates using Kubernetes specs and set parameters to create new objects based on it.
 
-
-![demo](img/demo.git?raw=true "demo")
+<p align="center"><img src="img/demo.git?raw=true"/></p>
 
 ## Use case
 Many kubernetes clusters are shared among many applications and teams. Sometimes services are available within the cluster scope and teams can use it to create or configure services using kubernetes spec (such as ConfigMap, Secret, PrometheusRule, ExternalDNS, etc.). Some of these specs are too complex or contains some configurations that we do not want to expose. You can automate it's creation using this operator.