Adding icon and category for TMC catalog

[lucasmarzocco]

Currently, adding Cloudhealth helm repo shows the cloudhealth-collector helm chart but displays no category (can't sort) and no icon like all of the bitnami repos do. This should change that.

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[gm-cht]

@lucasmarzocco Check this PR out: https://github.com/CloudHealth/helm/pull/102/files. I was adding an icon there anyway..

For the category field, helm does not allow a new field in Chart.yml. I added category: Cost to annotations in the above mentioned PR.

As of [v3.3.2](https://github.com/helm/helm/releases/tag/v3.3.2), additional fields are not allowed. The recommended approach is to add custom metadata in annotations. https://helm.sh/docs/topics/charts/

Let me know if it works.

[lucasmarzocco]

@gm-cht: Should I close this MR if you're going to merge the same changes in yours? When do you expect to have them merged and ready to be used?

[gm-cht]

Yes. This PR can be closed. The other PR will be merged early next week..

[gm-cht]

Release 4.2.0 of the helm chart (currently being tested) has these changes.

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