Add slides 18-23: Terraform platforms + full Ansible section

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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@@ -188,6 +188,78 @@ output "public_ip" {
     <em>Drop-in replacement. Fully compatible. Community-driven.</em></p>
   </section>
 
+  <!-- ─── SLIDE 18 : Terraform platforms ──────────────────────────── -->
+  <section>
+    <h2>Terraform at scale needs a platform.</h2>
+    <p>
+      <strong>Terraform Enterprise / HCP Terraform</strong> — HashiCorp's commercial offering: remote state, RBAC, audit logs<br>
+      <strong>Spacelift</strong> — GitOps-first CI/CD for Terraform (and OpenTofu)<br>
+      <strong>Atlantis</strong> — open-source: plan &amp; apply triggered by pull requests<br>
+      <strong>env0, Scalr</strong> — SaaS alternatives with policy &amp; cost management
+    </p>
+  </section>
+
+  <!-- ─── SLIDE 19 : Ansible intro ─────────────────────────────────── -->
+  <section>
+    <h2>⚡ <span class="ansible-col">Ansible</span></h2>
+    <p>Your servers are provisioned. Now make them do something.</p>
+  </section>
+
+  <!-- ─── SLIDE 20 : Ansible concepts ──────────────────────────────── -->
+  <section>
+    <h2>Push, not pull. SSH, not agents.</h2>
+    <p>YAML playbooks run tasks in order, across any number of hosts.<br>
+    No daemon. No certificate authority. Just Python + SSH.<br>
+    <em>Idempotent modules ensure the same playbook can run safely again and again.</em></p>
+  </section>
+
+  <!-- ─── SLIDE 21 : Ansible code ──────────────────────────────────── -->
+  <section>
+    <p class="filename"># playbook/webserver.yml</p>
+    <pre><code class="language-yaml" data-trim>
+- name: Configure web server
+  hosts: webservers
+  become: true
+
+  tasks:
+    - name: Install nginx
+      ansible.builtin.package:
+        name: nginx
+        state: present
+
+    - name: Deploy nginx config
+      ansible.builtin.template:
+        src: nginx.conf.j2
+        dest: /etc/nginx/nginx.conf
+      notify: Restart nginx
+
+  handlers:
+    - name: Restart nginx
+      ansible.builtin.service:
+        name: nginx
+        state: restarted
+    </code></pre>
+  </section>
+
+  <!-- ─── SLIDE 22 : Ansible Galaxy ────────────────────────────────── -->
+  <section>
+    <h2>The community does the heavy lifting.</h2>
+    <p><strong>Ansible Galaxy</strong> — 10,000+ ready-made roles and collections.<br>
+    Don't write a playbook to install Docker from scratch. Someone already did.<br>
+    <em>Just <code>ansible-galaxy install geerlingguy.docker</code>.</em></p>
+  </section>
+
+  <!-- ─── SLIDE 23 : Ansible platforms ────────────────────────────── -->
+  <section>
+    <h2>Ansible at scale: open-source vs enterprise.</h2>
+    <p>
+      <strong>AWX</strong> — open-source web UI, API, and scheduler for Ansible<br>
+      <strong>Ansible Automation Platform</strong> (Red Hat) — enterprise version of AWX, with support &amp; integrations<br>
+      <strong>Semaphore</strong> — lightweight open-source alternative to AWX<br>
+      <em>The core Ansible engine remains Apache 2.0 — truly open-source.</em>
+    </p>
+  </section>
+
 
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