Initial commit: GitOps Starter Pack

A teaching-first, single-cluster GitOps setup: Talos Linux + Argo CD with
an app-of-apps layout, MetalLB pre-installed for real LoadBalancer IPs on
bare metal, a demo app, and a progressive docs/ walkthrough with a
CLAUDE.md tutor persona and guided bootstrap checklist.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/demo/configmap.yaml

@@ -0,0 +1,27 @@
+# A ConfigMap is just a bag of key/value data — in this case, a small HTML
+# file — that lives in the cluster as its own object, separate from the
+# Pod that uses it. We mount it into the nginx container below instead of
+# baking the page into a custom container image.
+#
+# Why this matters for the GitOps story: this is the file you'll edit in
+# docs/06-your-first-change.md. Change the text here, commit, push, and
+# watch Argo CD notice the difference in Git and push it into the cluster
+# for you — no `kubectl` command involved. That's the whole loop, proven
+# with one line of HTML.
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: demo-page
+  namespace: demo
+data:
+  index.html: |
+    <!doctype html>
+    <html>
+      <head><title>It works!</title></head>
+      <body style="font-family: sans-serif; text-align: center; margin-top: 10%;">
+        <h1>It works!</h1>
+        <p>This page is being served from a Kubernetes cluster that Argo CD
+        deployed straight from Git. Edit <code>apps/demo/configmap.yaml</code>,
+        commit, push, and refresh this page.</p>
+      </body>
+    </html>