style: reduce h2 to 1.3em and shorten 4 long titles

Ensure all slide titles fit on a single line at 1280px:
- h2 font-size: 1.3em (was ~1.6em default)
- Shortened slides 7, 8, 18, 32

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

index.html

@@ -53,6 +53,7 @@
     }
 
     .reveal h1, .reveal h2 { text-align: left; }
+    .reveal h2 { font-size: 1.3em; }
 
     .title-slide, .title-slide h1 { text-align: center !important; }
     .title-slide .subtitle { color: var(--ods-text); }
@@ -393,7 +394,7 @@
 
   <!-- ─── SLIDE 7 ─────────────────────────────────────────────────── -->
   <section>
-    <h2>Each one is unique. Unreproducible. Undocumented.</h2>
+    <h2>Unique. Unreproducible. Undocumented.</h2>
     <p><em>Welcome to Snowflake Hell.</em></p>
     <img src="https://media.giphy.com/media/QMHoU66sBXqqLqYvGO/giphy.gif"
          alt="This is fine"
@@ -402,7 +403,7 @@
 
   <!-- ─── SLIDE 8 ─────────────────────────────────────────────────── -->
   <section>
-    <h2>Configuration drift is silent… until it isn't.</h2>
+    <h2>Configuration drift is silent…</h2>
     <p><em>Prod breaks on a Tuesday. You can't reproduce the bug locally. You can't scale reliably. You can't onboard a new server without fear.</em></p>
     <svg width="750" height="220" style="margin-top:0.5em;" viewBox="0 0 750 220" xmlns="http://www.w3.org/2000/svg">
       <line x1="60" y1="180" x2="700" y2="180" stroke="#666666" stroke-width="2.5"/>
@@ -721,7 +722,7 @@ Apply complete! Resources: 2 added, 0 changed, 0 destroyed.
 
   <!-- ─── SLIDE 18 : OpenTofu ─────────────────────────────────────── -->
   <section class="s-tf">
-    <h2>In 2023, HashiCorp changed Terraform's license.</h2>
+    <h2>HashiCorp changed Terraform's license.</h2>
     <ul>
       <li><strong>BSL</strong> instead of MPL — no longer truly open-source</li>
       <li>The community responded: <strong>OpenTofu</strong>, by the OpenTF Foundation</li>
@@ -1012,7 +1013,7 @@ Notice: Applied catalog in 12.34 seconds
 
   <!-- ─── SLIDE 32 : Puppet platforms ─────────────────────────────── -->
   <section class="s-puppet">
-    <h2>Puppet is for large fleets that can't afford drift.</h2>
+    <h2>Puppet: large fleets, zero drift.</h2>
     <ul>
       <li>Continuous compliance, auditability, and guaranteed state — at scale</li>
       <li>Best suited for enterprises with hundreds or thousands of long-lived servers</li>