docs: replace enterprise-base image references with example-base (#27025)

Follow-up to #27018, sweeping the remaining
`codercom/enterprise-base:ubuntu` references to
`codercom/example-base:ubuntu` and `coder/enterprise-images` links to
[coder/images](https://github.com/coder/images). The `example-` prefix
is the recommended one for new deployments per the coder/images README.

Covers the 11 docs pages flagged by doc-check on #27018 plus the
embedded `examples/templates/docker` and `examples/templates/kubernetes`
starter templates (image string only; the `image` variable lives in the
coder/registry templates, see coder/registry#943).

OpenShift imagestream names in `docs/install/openshift.md` keep the
`enterprise-base` local name; only the upstream image reference changed.

Part of DEVREL-201.

🤖 Generated with Coder Agents using Claude, on behalf of @bpmct

examples/examples.gen.json

@@ -183,7 +183,7 @@
 			"kubernetes",
 			"container"
 		],
-		"markdown": "\n# Remote Development on Kubernetes Pods\n\nProvision Kubernetes Pods as [Coder workspaces](https://coder.com/docs/user-guides/workspace-management) with this example template.\n\n\u003c!-- TODO: Add screenshot --\u003e\n\n## Prerequisites\n\n### Infrastructure\n\n**Cluster**: This template requires an existing Kubernetes cluster\n\n**Container Image**: This template uses the [codercom/enterprise-base:ubuntu image](https://github.com/coder/enterprise-images/tree/main/images/base) with some dev tools preinstalled. To add additional tools, extend this image or build it yourself.\n\n### Authentication\n\nThis template authenticates using a `~/.kube/config`, if present on the server, or via built-in authentication if the Coder provisioner is running on Kubernetes with an authorized ServiceAccount. To use another [authentication method](https://registry.terraform.io/providers/hashicorp/kubernetes/latest/docs#authentication), edit the template.\n\n## Architecture\n\nThis template provisions the following resources:\n\n- Kubernetes pod (ephemeral)\n- Kubernetes persistent volume claim (persistent on `/home/coder`)\n\nThis means, when the workspace restarts, any tools or files outside of the home directory are not persisted. To pre-bake tools into the workspace (e.g. `python3`), modify the container image. Alternatively, individual developers can [personalize](https://coder.com/docs/user-guides/workspace-dotfiles) their workspaces with dotfiles.\n\n\u003e **Note**\n\u003e This template is designed to be a starting point! Edit the Terraform to extend the template to support your use case.\n"
+		"markdown": "\n# Remote Development on Kubernetes Pods\n\nProvision Kubernetes Pods as [Coder workspaces](https://coder.com/docs/user-guides/workspace-management) with this example template.\n\n\u003c!-- TODO: Add screenshot --\u003e\n\n## Prerequisites\n\n### Infrastructure\n\n**Cluster**: This template requires an existing Kubernetes cluster\n\n**Container Image**: This template uses the [codercom/example-base:ubuntu image](https://github.com/coder/images/tree/main/images/base) with some dev tools preinstalled. To add additional tools, extend this image or build it yourself.\n\n### Authentication\n\nThis template authenticates using a `~/.kube/config`, if present on the server, or via built-in authentication if the Coder provisioner is running on Kubernetes with an authorized ServiceAccount. To use another [authentication method](https://registry.terraform.io/providers/hashicorp/kubernetes/latest/docs#authentication), edit the template.\n\n## Architecture\n\nThis template provisions the following resources:\n\n- Kubernetes pod (ephemeral)\n- Kubernetes persistent volume claim (persistent on `/home/coder`)\n\nThis means, when the workspace restarts, any tools or files outside of the home directory are not persisted. To pre-bake tools into the workspace (e.g. `python3`), modify the container image. Alternatively, individual developers can [personalize](https://coder.com/docs/user-guides/workspace-dotfiles) their workspaces with dotfiles.\n\n\u003e **Note**\n\u003e This template is designed to be a starting point! Edit the Terraform to extend the template to support your use case.\n"
 	},
 	{
 		"id": "kubernetes-devcontainer",

examples/templates/docker/main.tf

@@ -173,7 +173,7 @@ resource "docker_volume" "home_volume" {
 
 resource "docker_container" "workspace" {
   count = data.coder_workspace.me.start_count
-  image = "codercom/enterprise-base:ubuntu"
+  image = "codercom/example-base:ubuntu"
   # Uses lower() to avoid Docker restriction on container names.
   name = "coder-${data.coder_workspace_owner.me.name}-${lower(data.coder_workspace.me.name)}"
   # Hostname makes the shell more user friendly: coder@my-workspace:~$

examples/templates/kubernetes/README.md

@@ -19,7 +19,7 @@ Provision Kubernetes Pods as [Coder workspaces](https://coder.com/docs/user-guid
 
 **Cluster**: This template requires an existing Kubernetes cluster
 
-**Container Image**: This template uses the [codercom/enterprise-base:ubuntu image](https://github.com/coder/enterprise-images/tree/main/images/base) with some dev tools preinstalled. To add additional tools, extend this image or build it yourself.
+**Container Image**: This template uses the [codercom/example-base:ubuntu image](https://github.com/coder/images/tree/main/images/base) with some dev tools preinstalled. To add additional tools, extend this image or build it yourself.
 
 ### Authentication
 

examples/templates/kubernetes/main.tf

@@ -285,7 +285,7 @@ resource "kubernetes_deployment_v1" "main" {
 
         container {
           name              = "dev"
-          image             = "codercom/enterprise-base:ubuntu"
+          image             = "codercom/example-base:ubuntu"
           image_pull_policy = "Always"
           command           = ["sh", "-c", coder_agent.main.init_script]
           security_context {