Issue#59 task prepare this repository to be available on artifact hub

[mwallschlaeger]

Description

moving default charts location from deployments/geonode to default charts/geonode. Furhter added release workflow using helm/chart-releaser-action@v1.5.0. Which handles changes to the index.yaml and so on required by artifacts on push to main in a seperate branch called gh-pages

artifacthub entry: https://artifacthub.io/packages/helm/geonode-k8s/geonode-k8s

Please select the relevant option:

• [ ] Bug fix
• [x] New feature
• [x] Documentation update
• [x] Refactoring
• [ ] Other (please describe)

Related Issue

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closes #59 closes #58

Checklist

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• The pull request is limited to one type (docs, feature, bug fix, etc.)
• The pull request is as small as possible. Consider opening multiple pull requests instead of one large one.
• The feature or bug fix has been discussed and documented in an issue beforehand.

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