Add h1 headings to all 4 section index pages

code/index.njk

@@ -12,6 +12,7 @@ subcategories:
   - "Retro"
   - "Web Projects"
 ---
+<h1>Open Source Projects</h1>
 <p class="site-intro">A curated catalog of my public GitHub projects, sorted by topic.</p>
 
 {% for subcat in subcategories %}

infra/index.njk

@@ -34,6 +34,7 @@ sections:
         summary: "Multi-WAN router with WiFi and Powerline failover, plus IoT VLAN 189 isolation."
         href: "/infra/openwrt/"
 ---
+<h1>Homelab Infrastructure</h1>
 <p class="site-intro">A peek under the hood of my homelab. Proxmox, Synology, Docker, and how everything is wired together.</p>
 
 {% include "card-grid.njk" %}

retro/index.njk

@@ -56,6 +56,7 @@ sections:
         href: "/retro/retro-corner-snapshot/"
 
 ---
+<h1>Retro Computing</h1>
 <p class="site-intro">Hardware I've collected and kept running over the years. From Atari ST and Amiga to MiSTer FPGA and DOS environments.</p>
 
 {% include "card-grid.njk" %}

smarthome/index.njk

@@ -78,6 +78,7 @@ sections:
         href: "/smarthome/kids-rfid-player/"
         emoji: "🎵"
 ---
+<h1>Smart Home Projects</h1>
 <p class="site-intro">The heart of the homelab. Home Assistant, MQTT sensors, dashboards, and automation projects that make everyday life a little more interesting.</p>
 
 {% include "card-grid.njk" %}