Initial commit: Hugo site with Caddy infra and deploy tooling

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

infra/Caddyfile

@@ -0,0 +1,24 @@
+monotrope.au {
+	root * /var/www/monotrope
+	file_server
+
+	# Compression
+	encode zstd gzip
+
+	# Cache headers for static assets
+	@static {
+		path *.css *.js *.ico *.gif *.jpg *.jpeg *.png *.webp *.svg *.woff *.woff2 *.ttf *.eot
+	}
+	header @static Cache-Control "public, max-age=31536000, immutable"
+
+	# HTML and RSS — revalidate each time
+	@html {
+		path *.html / /posts/ /posts/*
+	}
+	header @html Cache-Control "public, max-age=0, must-revalidate"
+}
+
+# Redirect www to apex
+www.monotrope.au {
+	redir https://monotrope.au{uri} permanent
+}