- Set up cert-manager explicitly, since it can not be set up as
  a dependent chart of our 'support' chart.
- 'support' chart deploys prometheus, grafana and nginx-ingress
  in a standard configuration.
- Allow per-cluster overrides with config under support/clusters.
- Add a script that will provision the support components.

Ref 2i2c-org#388

- Automates auth to cluster for automated deployment
- Puts config overrides in same place as cluster config, to
  avoid duplication
- Sets up HTTPS for the 2i2c pilot hubs grafana

- traefik tag bump was required to get LE working. It's
  already bumped in newer z2jh versions
- NFS server was again set up manually, and needed the `insecure`
  flag - even though other hubs are setup the same way and didn't
  need this. NFS situation needs to be sorted.

Ref 2i2c-org#207

- Setup the cluster with the [terraform google provider][1], instead
  of the higher level [gke module][2]. The code gets simpler, and
  makes more terraform features (like for_each) accessible more easily.
- Allow multiple notebook and dask nodepools to be set up. Most
  research hubs want 2-3 options of notebook sizes to optimize for
  spend. I attempted to use [gke node autoprovisioning][3] instead of
  requiring manual nodepool provisioning, but it consistently
  provisioned nodes bigger than required. We should re-evaluate it
  later.
- Expose the GCP SA used by the k8s nodes to the user pods. A highly
  restricted SA is used for this, to prevent damage as much as possible.
  Users can then make requests to GCS buckets in other
  projects on behalf of this project.
- Dask Nodepools will default to matching sizes of the notebook
  nodepools. Can be overriden if necessary.
- Split terraform code into multiple files for easier maintenance
- Move tfvars files into a subdirectory and split terraform code
  into multiple files for easier maintenance
- Remove unused terraform variables
- Add some inline terraform docs
- Setup MOEM-IGE cluster + hub with new terraform code

[1]: https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/container_cluster
[2]: https://registry.terraform.io/modules/terraform-google-modules/kubernetes-engine/google/latest
[3]: https://cloud.google.com/kubernetes-engine/docs/how-to/node-auto-provisioning

- Data bucket for storing per-hub data products
- Scratch bucket for *per-user* data stuff

- Testing against {} doesn't seem to work. Checking length is
  a bit more obtuse, but works consistently.
- Fix what goes in the True / False arms of the ternary operator -
  was swapped out earlier.

Calls terraform-docs dynamically from sphinx

- Remove terraform-specific dir, not enough docs there.
  Autogenerated reference docs will be moved to a different
  PR as I can't seem to get conda to work

Can't seem to get conda to work on RTD for now

Leftover from environment.yml conversion

Co-authored-by: Sarah Gibson <44771837+sgibson91@users.noreply.github.com>

Co-authored-by: Sarah Gibson <44771837+sgibson91@users.noreply.github.com>

This wasn't working earlier because of a typo in
.readthedocs.yml that I didn't spot

This reverts commit c77ef3e.

Since conda seems to now work with RTD

This reverts commit 70b39e8.

--output requires a newer version of terraform-docs on
conda-forge
(conda-forge/go-terraform-docs-feedstock#25).