provider: Remove website and website-test Makefile targets (#14503)
provider: Remove website and website-test Makefile targets (#14503)

Since the provider has been migrated to the Terraform Registry documentation, the provider website portions for terraform.io in the terraform-website repository will be removed soon. There is currently no replacement for fully emulating the whole provider documentation, but there is existing functionality for parts of this today. In the future, full emulation might be possible again but there are no timelines for that implementation.

* Link checking handled via GitHub Actions and `markdown-link-check` (see `.github/workflows/website.yml`)
* Terraform Registry documentation preview rendering (single source code page): https://registry.terraform.io/tools/doc-preview

At some point, we can also remove the legacy `website/aws.erb` side navigation file, however doing so will break open contributions modifying the file.
terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws