Update the example pravega custom resource file

[nishant-yt]

Description

The example pravega custom resource file needs to be updated with correct set of values for Segment Store JVM options and many other pravega fields and options. Also the folder can be deleted to avoid duplication

Importance

must-have

Location

https://github.com/pravega/pravega-operator/blob/master/deploy/crds/cr.yaml

Suggestions for an improvement

Provide all the necessary values in the file for Segment Store JVM options and other fields which can be set by the user. Also delete the example folder to avoid duplication and make sure if any wiki is dependent on the example folder is updated accordingly