add: integration with helm for deployment

[VanillaSpoon]

Issue link

fixes #12

What changes have been made

This PR integrates helm to manage the deployment process of instascale. This change is in line with the current deployment process of MCAD and aims to bring more consistency across the projects.

This pr also updates the documentation regarding deployment.

Verification steps

• Install the Helm Client on your local machine here.

When deploying instascale to an OSD cluster:

cd deployment 
helm install instascale instascale

Then check to ensure each of the following have been deployed correctly and are operational: instascale-configmap instascale-sa instascale-crb instascale-cr instascale

Checks

• [ ] I've made sure the tests are passing.
• Testing Strategy
  • [ ] Unit tests
  • [x] Manual tests
  • [ ] Testing is not required for this change

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[anishasthana]

I get going for consistency, but imo we should still push for using only the operator for instascale installation. With MCAD, the helm charts are around from before the operator being a thing.