[doc] Adds operator deployment steps in OpenShift

[alosadagrande]

This PR updates documentation:

• It divides the README into two main blocks: deployment via operator in OpenShift and local deployment (testing)
• Deployment of the IMS operator on top of OpenShift
• Configuration of the different microservices of the IMS operator using the ORANO2MS CR. There was no example of that CR in the repo.
• Currently only metadata, deployment manager and resource server. The rest could be added once they are validated in the operator deployment.
• An index is added to ease navigation through the information

Let me know your thoughts.

[bartwensley]

/cc @Missxiaoguo @irinamihai

Angie and Irina would be the best ones to review this.

[alosadagrande]

Comments addressed. PTAL.

[mmorency2021]

i have tried to test the CRs in this PR for instance the metadata Kind and also the api version seems wrong.
from this discussion : https://redhat-internal.slack.com/archives/C07A9NFCS01/p1726609509792089
the new kind used is : Inventory. and the api version is : o2ims.oran.openshift.io/v1alpha1.

[bartwensley]

@alosadagrande - it would be great if you could update this PR to address the comments and to incorporate the latest changes to how we deploy the operator.

[alosadagrande]

@bartwensley @alegacy could you open it again, sorry not sure how it happened :(

[bartwensley]

Looks good - just a couple minor comments.

[alosadagrande]

Addressed all comments. Thank you for your feedback

[bartwensley]

/lgtm

[alegacy]

/approve

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/retest-required