Add nginx config

docker/Dockerfile.nginx.prod

@@ -1,3 +1,4 @@
 FROM nginx:stable
 
+COPY docker/nginx.conf /etc/nginx/conf.d/default.conf
 COPY dist /usr/share/nginx/html

docker/nginx.conf

@@ -0,0 +1,25 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # 404 fallback
+    error_page 404 /404.html;
+
+    # Static assets caching
+    location /_astro/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # Redirect old article URLs (/articles/YYYY/MM/DD/slug/ -> /articles/YYYY-MM-DD-slug/)
+    location ~ "^/articles/(\d\d\d\d)/(\d\d)/(\d\d)/([^/]+)/?$" {
+        return 301 /articles/$1-$2-$3-$4/;
+    }
+
+    # Redirect old atom feed
+    location = /atom.xml {
+        return 301 /rss.xml;
+    }
+}