feat: rebuild site on Hugo + bonsai theme

Replace the custom Node.js builder with Hugo and the bonsai theme
(added as a submodule at themes/bonsai). Site content moves from
config.yaml into [params] in hugo.toml. CI switched to Hugo Extended
0.154.0 build; daily cron dropped (no API decoration to refresh).
Avatar imported from miti99 project.

.gitignore

@@ -1,36 +1,16 @@
-# Dependencies
-node_modules/
-.pnp
-.pnp.js
-
-# Build output
-dist/
-build/
-out/
-.next/
-.nuxt/
-.cache/
-_site/
+# Hugo build output
+public/
+resources/_gen/
+.hugo_build.lock
 
 # Env / secrets
 .env
 .env.*
 !.env.example
 
-# Logs
-*.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-pnpm-debug.log*
-
 # Editor / OS
 .vscode/
 .idea/
 *.swp
 .DS_Store
 Thumbs.db
-
-# Misc
-coverage/
-.tmp/