[add] construction landing page

nginx/default.conf

@@ -0,0 +1,16 @@
+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ =404;
+    }
+
+    location /assets/ {
+        expires 30d;
+        add_header Cache-Control "public";
+    }
+}