add lastUpdated configuration and extend content in 人民的鱼.md

.vitepress/config.mts

@@ -2,4 +2,11 @@ import { defineConfig } from "vitepress";
 
 export default defineConfig({
   lang: "zh-CN",
+  themeConfig: {
+    lastUpdated: {
+      formatOptions: {
+        dateStyle: "full",
+      },
+    },
+  },
 });