feat: add Trinity hero artwork to About page

Added epic Trinity fantasy artwork showing Frost (left, cyan/ice),
Arcane (center, purple/lightning), and Fire (right, orange/flames).

IMAGE DETAILS:
- File: trinity-final.png
- Path: /assets/images/2026/03/
- Position: Between 'The Trinity' title and founder cards
- Styling: Rounded corners, Frost cyan shadow for visual pop

This artwork perfectly represents the three founders and their
elemental identities before introducing each founder individually.

Signed-off-by: Claude (Chronicler #56) <claude@firefrostgaming.com>

about.njk

@@ -14,7 +14,12 @@ description: Meet The Trinity founders and our five consultant animals. Building
 <!-- THE TRINITY: THREE FOUNDERS -->
 <div style="padding: 100px 60px; background: linear-gradient(135deg, #1a1a2e 0%, #0f0f1e 100%);">
   <div style="max-width: 1400px; margin: 0 auto;">
-    <h2 style="text-align: center; font-size: 3rem; margin-bottom: 60px; color: #e8f4f8; font-weight: 800;">The Trinity</h2>
+    <h2 style="text-align: center; font-size: 3rem; margin-bottom: 40px; color: #e8f4f8; font-weight: 800;">The Trinity</h2>
+    
+    <!-- Trinity Hero Image -->
+    <div style="text-align: center; margin-bottom: 60px;">
+      <img src="/assets/images/2026/03/trinity-final.png" alt="The Trinity - Frost, Arcane, and Fire" style="max-width: 100%; height: auto; border-radius: 15px; box-shadow: 0 8px 30px rgba(78, 205, 196, 0.3);" />
+    </div>
     
     <div style="display: grid; grid-template-columns: repeat(3, 1fr); gap: 50px; margin-bottom: 80px;">