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>

i18n/fr.toml

@@ -0,0 +1,17 @@
+[recent_posts]
+other = "Articles récents"
+
+[read_more]
+other = "Lire la suite"
+
+[table_of_contents]
+other = "Table des matières"
+
+[tags]
+other = "Mots-clés"
+
+[previous]
+other = "Précédent"
+
+[next]
+other = "Suivant"