Consolidate all moonweb sites into single Eleventy config

- Single eleventy.config.js at root with computed pathPrefix per section
- Accent colors inlined in base.njk (no per-site theme.css needed)
- Hub pages output at root via explicit permalinks
- Per-section sitemaps with tag-based collections
- .eleventyignore excludes stefankoelle, timecapsule, markdown files
- Deleted: 5 per-site configs, merge script
- Simplified: package.json (single build/dev commands)
- Simplified: GitHub Actions workflow (no matrix, no merge job)
- Fixed: parent links for sub-site detail pages

retro/404.html

@@ -1,9 +1,10 @@
 ---
 title: "Page Not Found"
 section: "retro"
+tags: "retro"
 description: "The page you are looking for does not exist."
 layout: base.njk
-permalink: /404.html
+permalink: /retro/404.html
 ---
 <div class="error-page">
   <h1>404</h1>

retro/amiga-hardware-landscape/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "Running AmigaOS in 2026: MiSTer FPGA vs Amiberry on Pi"
 section: "retro"
+tags: "retro"
 description: "Two very different ways to get a fully working AmigaOS 3.2.3 desktop running today."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>Running AmigaOS in 2026: MiSTer FPGA vs Amiberry on Pi</h1>
 <div class="detail-content">

retro/amiga-modern-platforms/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "Vampire V4, A600GS or MiSTer: Amiga Hardware Isn't a Simple Speed Race"
 section: "retro"
+tags: "retro"
 description: "Why raw benchmark numbers are actively misleading when comparing modern Amiga hardware options."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>Vampire V4, A600GS or MiSTer: Amiga Hardware Isn't a Simple Speed Race</h1>
 <div class="detail-content">

retro/atari-mega-st-fleet/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "The Atari Mega ST Fleet: Three Machines, Three Jobs"
 section: "retro"
+tags: "retro"
 description: "How three Atari Mega ST computers ended up with completely different roles in a modern retro setup."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>The Atari Mega ST Fleet: Three Machines, Three Jobs</h1>
 <div class="detail-content">

retro/atari-monitor-compatibility/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "The 15kHz Problem: Finding a Monitor That Speaks Atari"
 section: "retro"
+tags: "retro"
 description: "Why most modern monitors refuse to display Atari ST colour modes, and which ones actually work."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>The 15kHz Problem: Finding a Monitor That Speaks Atari</h1>
 <div class="detail-content">

retro/atari-networking-bbs/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "Getting a 40-Year-Old Computer Online: Atari ST Networking and BBS Access"
 section: "retro"
+tags: "retro"
 description: "Connecting an Atari ST to the modern internet and to dial-up-era bulletin board systems, warts and all."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>Getting a 40-Year-Old Computer Online: Atari ST Networking and BBS Access</h1>
 <div class="detail-content">

retro/batocera-living-room/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "Batocera in the Living Room: One Box, Every Retro System"
 section: "retro"
+tags: "retro"
 description: "Why the living room emulation station takes a completely different approach than the FPGA rigs upstairs."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>Batocera in the Living Room: One Box, Every Retro System</h1>
 <div class="detail-content">

retro/dos-486-tower/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "The 486 DX2-66: Rebuilding a DOS Era on MiSTer FPGA"
 section: "retro"
+tags: "retro"
 description: "Recreating a Vobis-Highscreen 486 DX2-66 setup on MiSTer FPGA, down to the original DOS configuration."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>The 486 DX2-66: Rebuilding a DOS Era on MiSTer FPGA</h1>
 <div class="detail-content">

retro/eleventy.config.js

@@ -1,20 +0,0 @@
-module.exports = function (eleventyConfig) {
-  eleventyConfig.addGlobalData("site", { url: "https://www.moonweb.org", pathPrefix: "/retro" });
-  eleventyConfig.addFilter("date", (d) => d.toISOString());
-  eleventyConfig.addPassthroughCopy({ "shared/theme-retro.css": "theme.css" });
-  eleventyConfig.addPassthroughCopy({ "shared/base.css": "shared-base.css" });
-  eleventyConfig.addPassthroughCopy({ "shared/favicon/retro.svg": "favicon.svg" });
-  eleventyConfig.addPassthroughCopy({ "retro/robots.txt": "robots.txt" });
-
-  return {
-    dir: {
-      input: "retro",
-      includes: "../shared/_includes",
-      output: "dist/retro"
-    },
-    serverOptions: {
-      host: "0.0.0.0",
-      port: 8085
-    }
-  };
-};

retro/et4000-experiment/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "Why an ET4000 Graphics Card and a Mega ST Don't Mix (Yet)"
 section: "retro"
+tags: "retro"
 description: "A cautionary tale about pushing 1980s power supplies past their limits with a modern-ish graphics card."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>Why an ET4000 Graphics Card and a Mega ST Don't Mix (Yet)</h1>
 <div class="detail-content">

retro/index.njk

@@ -1,6 +1,7 @@
 ---
 title: "Retro Computing — Vintage Hardware & FPGA | moonweb"
 section: "retro"
+tags: "retro"
 description: "Physical retro hardware collection — Raspberry Pi units, Pi 400, and vintage computing setups."
 layout: base.njk
 sections:

retro/mini-arcade-handheld-roundup/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "Mini Arcades and Handhelds: Sorting the Real Deal from the Bootlegs"
 section: "retro"
+tags: "retro"
 description: "A buyer's guide to compact retro gaming devices, and why the cheapest option is almost never the right one."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>Mini Arcades and Handhelds: Sorting the Real Deal from the Bootlegs</h1>
 <div class="detail-content">

retro/mist-mister-fpga/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "MiST and MiSTer: Two FPGA Boxes, Two Very Different Personalities"
 section: "retro"
+tags: "retro"
 description: "Why the newer, more powerful MiSTer isn't automatically the better choice for every retro system."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>MiST and MiSTer: Two FPGA Boxes, Two Very Different Personalities</h1>
 <div class="detail-content">

retro/pimiga-journey/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "PiMiga 3 to 5: Chasing the Perfect Amiga-on-a-Pi Distro"
 section: "retro"
+tags: "retro"
 description: "Three generations of PiMiga later, here's what actually changed — and why newer isn't always better."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>PiMiga 3 to 5: Chasing the Perfect Amiga-on-a-Pi Distro</h1>
 <div class="detail-content">

retro/retro-corner-snapshot/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "The Retro Corner Today: A Snapshot of the Whole Setup"
 section: "retro"
+tags: "retro"
 description: "A tour through every retro system currently active across the home, room by room."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>The Retro Corner Today: A Snapshot of the Whole Setup</h1>
 <div class="detail-content">

retro/sitemap.xml.njk

@@ -1,5 +1,6 @@
 ---
-permalink: /sitemap.xml
+permalink: /retro/sitemap.xml
+sitemapCollection: "retro"
 eleventyExcludeFromCollections: true
 ---
 {% include "sitemap.njk" %}

retro/the-a1200/index.njk

@@ -1,9 +1,10 @@
 ---
 title: "The A1200: What We Know Before It Ships"
 section: "retro"
+tags: "retro"
 description: "A close look at Retro Games Ltd.'s upcoming Amiga 1200 console, based on everything public so far."
 layout: base.njk
-parent: "/"
+parent: "/retro/"
 ---
 <h1>The A1200: What We Know Before It Ships</h1>
 <div class="detail-content">