Serve multisite blogs from explicit Nginx roots

deploy/blog-locations.conf

@@ -0,0 +1,19 @@
+index index.html;
+
+access_log /var/log/nginx/access.log;
+error_log /var/log/nginx/error.log warn;
+
+location = /nginx-health {
+  access_log off;
+  return 204;
+}
+
+location ~* \.(?:css|js|mjs|png|jpg|jpeg|gif|svg|webp|ico|woff2?)$ {
+  try_files $uri =404;
+  expires 1y;
+  add_header Cache-Control "public, immutable";
+}
+
+location / {
+  try_files $uri $uri/index.html /index.html /404.html;
+}