static export + nginx, drop runtime server

~800MiB -> ~5MiB RAM

nginx.conf

@@ -0,0 +1,21 @@
+server {
+    listen 80;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri.html $uri/ =404;
+    }
+
+    location /_next/static/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    location /images/ {
+        expires 30d;
+        add_header Cache-Control "public";
+    }
+
+    error_page 404 /404.html;
+}