Host a Helm Chart Repository for Coder Helm Charts

For deploying various Coder projects (especially `code-marketplace`, but also `code-server`) in a Kubernetes cluster, we would love to use the Helm charts provided in the official Git repositories by Coder.
Though our infrastructure only allows using Helm charts that are provided via conventional [chart repositories](https://helm.sh/docs/topics/chart_repository). This means we can not clone the Coder repos to get the Helm charts.

Therefore, we request Coder to host a Helm chart repository.
A chart repository can be hosted rather easily [using GitHub Pages](https://helm.sh/docs/topics/chart_repository#github-pages-example).

Other organizations also use GitHub Pages to host their charts, e.g. [vault-config-operator](https://github.com/redhat-cop/vault-config-operator) by redhat-cop is available at https://redhat-cop.github.io/vault-config-operator/index.yaml.