feat(IFK-11): migrate from Congo to HugoBlox with custom layouts

- Remove Congo theme submodule, add Hugo modules (blox-core)
- Custom baseof/single/home/list layouts (no Tailwind build needed)
- Newsreader serif font preserved throughout
- Agiliton lime/emerald brand colors
- All 7 shortcodes preserved (world-map, charts, stats, etc.)
- Multilingual EN/DE/FR with i18n files
- Self-hosted fonts, no external CSS dependencies
- Wide content layout, clean research-publication aesthetic

Reference: metaconscious.org, matteocourthoud.github.io

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

layouts/_default/home.html

@@ -0,0 +1,30 @@
+{{ define "main" }}
+<article class="prose max-w-3xl mx-auto py-12 px-4">
+  {{ .Content }}
+
+  <div class="mt-12">
+    <h2>{{ i18n "recent_posts" | default "Recent Articles" }}</h2>
+    <div class="grid gap-8">
+      {{ range first 5 .Site.RegularPages }}
+      <article class="border-b pb-8">
+        <h3 class="text-2xl font-newsreader mb-2">
+          <a href="{{ .Permalink }}" class="text-ifk-accent hover:text-ifk-accent-hover">
+            {{ .Title }}
+          </a>
+        </h3>
+        <div class="text-sm text-gray-600 mb-4">
+          <time datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date.Format "January 2, 2006" }}</time>
+          {{ with .Params.author }}— {{ . }}{{ end }}
+        </div>
+        <p class="text-lg font-newsreader leading-relaxed">
+          {{ .Summary }}
+        </p>
+        <a href="{{ .Permalink }}" class="inline-block mt-4 text-ifk-accent hover:text-ifk-accent-hover font-medium">
+          {{ i18n "read_more" | default "Read more" }} →
+        </a>
+      </article>
+      {{ end }}
+    </div>
+  </div>
+</article>
+{{ end }}