Fix card links on index pages: add section prefix to local hrefs

Links like /proxmox/ were missing the section prefix (e.g. /infra/proxmox/)
since all sites now share a single Eleventy build at root.

retro/index.njk

@@ -9,51 +9,51 @@ sections:
     cards:
       - title: "🖥️ The Mega ST Fleet"
         summary: "Three Mega ST 4 machines and a Mega ST 2, each with a clearly defined role from heirloom to workstation."
-        href: "/atari-mega-st-fleet/"
+        href: "/retro/atari-mega-st-fleet/"
       - title: "⚡ ET4000 Experiment"
         summary: "Why bolting a graphics card onto a Mega ST overloads a 1980s power supply, and what actually solved the resolution problem."
-        href: "/et4000-experiment/"
+        href: "/retro/et4000-experiment/"
       - title: "📺 Monitor Compatibility"
         summary: "The 15kHz problem explained, and which modern monitor panels actually cooperate with Atari colour modes."
-        href: "/atari-monitor-compatibility/"
+        href: "/retro/atari-monitor-compatibility/"
       - title: "🔌 Networking & BBS"
         summary: "Getting an Atari ST online via STinG and Wi-Fi modem hardware, and dialing into classic bulletin board systems."
-        href: "/atari-networking-bbs/"
+        href: "/retro/atari-networking-bbs/"
   - heading: "Amiga Corner"
     cards:
       - title: "💾 AmigaOS on Modern Platforms"
         summary: "Running AmigaOS 3.2.3 on MiSTer FPGA versus Amiberry on a Raspberry Pi, and the HDF pitfalls to avoid."
-        href: "/amiga-modern-platforms/"
+        href: "/retro/amiga-modern-platforms/"
       - title: "🥧 The PiMiga Journey"
         summary: "Three generations of the PiMiga distro compared, and why the newest release isn't automatically the best one."
-        href: "/pimiga-journey/"
+        href: "/retro/pimiga-journey/"
       - title: "⚔️ Vampire, A600GS or MiSTer"
         summary: "Why comparing modern Amiga hardware by benchmark numbers alone is actively misleading."
-        href: "/amiga-hardware-landscape/"
+        href: "/retro/amiga-hardware-landscape/"
       - title: "📦 The A1200"
         summary: "What's confirmed so far about Retro Games Ltd.'s upcoming Amiga 1200 console, ahead of its 2026 launch."
-        href: "/the-a1200/"
+        href: "/retro/the-a1200/"
   - heading: "FPGA & Emulation"
     cards:
       - title: "🧩 MiST and MiSTer"
         summary: "Two FPGA boards with two very different personalities, and why the newer one doesn't win every category."
-        href: "/mist-mister-fpga/"
+        href: "/retro/mist-mister-fpga/"
       - title: "🛋️ Batocera in the Living Room"
         summary: "The couch-friendly, software-emulation counterpart to the FPGA rigs, covering everything from Atari ST to arcade."
-        href: "/batocera-living-room/"
+        href: "/retro/batocera-living-room/"
       - title: "🕹️ Mini Arcades & Handhelds"
         summary: "A buyer's guide to compact retro gaming devices, and how to spot a bootleg clone before you buy one."
-        href: "/mini-arcade-handheld-roundup/"
+        href: "/retro/mini-arcade-handheld-roundup/"
   - heading: "DOS & PC"
     cards:
       - title: "💻 The 486 DX2-66"
         summary: "A complete DOS environment rebuilt 1:1 on MiSTer FPGA, down to the original AUTOEXEC.BAT."
-        href: "/dos-486-tower/"
+        href: "/retro/dos-486-tower/"
   - heading: "Overview"
     cards:
       - title: "🏠 The Retro Corner Today"
         summary: "A room-by-room snapshot of every retro system currently active across the home."
-        href: "/retro-corner-snapshot/"
+        href: "/retro/retro-corner-snapshot/"
 
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 <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>