build: use pm2 serve for prod.

ecosystem.config.js

@@ -3,11 +3,16 @@ module.exports = {
     {
       name: "blog-bs",
       script: "serve",
-      args: "-s build",
+      args: "",
       watch: false,
       ignore_watch: ["node_modules"],
       log_date_format: "MM-DD HH:mm:ss.SSS Z",
-      env: {},
+      env: {
+        PM2_SERVE_PATH: "./build",
+        PM2_SERVE_PORT: 7135,
+        PM2_SERVE_SPA: "true",
+        PM2_SERVE_HOMEPAGE: "/index.html",
+      },
       max_restarts: 5,
     },
   ],