add html-validator + fix html ceo code

nuxt.config.ts

@@ -1,6 +1,7 @@
 import config from "./config";
 
 import { fileURLToPath, URL } from "node:url";
+import head from "./config/head";
 // import sitemap from "./config/sitemap";
 // https://nuxt.com/docs/api/configuration/nuxt-config
 export default defineNuxtConfig({
@@ -17,9 +18,24 @@ export default defineNuxtConfig({
       dir: "./dist",
     },
   },
+
   alias: {
     "@": fileURLToPath(new URL("./", import.meta.url)),
   },
+
   css: ["@/assets/css/tailwind.css"],
   ...config,
+  htmlValidator: {
+    usePrettier: true,
+    logLevel: "warning",
+    failOnError: false,
+  },
+  app: {
+    head: {
+      htmlAttrs: {
+        lang: "ru",
+      },
+      ...head,
+    },
+  },
 });