Add internationalization support with astro-i18next integration

- Implemented astro-i18next for multi-language support, including English, Dutch, and Italian.
- Configured default locale and language fallback settings.
- Defined routes for localized content in the configuration.
- Updated package.json and package-lock.json to include new dependencies for i18next and related plugins.

astro.config.mjs

@@ -1,11 +1,48 @@
 import { defineConfig } from 'astro/config';
 import tailwind from '@astrojs/tailwind';
+import astroI18next from 'astro-i18next';
 
 // https://astro.build/config
 export default defineConfig({
   site: 'https://tiber365.it',
   integrations: [
     tailwind(),
+    astroI18next({
+      defaultLocale: "en",
+      locales: ["en", "nl", "it"],
+      i18next: {
+        debug: true,
+        initImmediate: false,
+        supportedLngs: ["en", "nl", "it"],
+        fallbackLng: "en",
+        load: "all"
+      },
+      i18nextPlugins: { fsBackend: 'i18next-fs-backend' },
+      showDefaultLocale: true,
+      routes: {
+        en: {
+          about: 'about',
+          services: 'services',
+          contact: 'contact',
+          privacy: 'privacy',
+          terms: 'terms'
+        },
+        nl: {
+          about: 'over-ons',
+          services: 'diensten',
+          contact: 'contact',
+          privacy: 'privacy',
+          terms: 'voorwaarden'
+        },
+        it: {
+          about: 'chi-siamo',
+          services: 'servizi',
+          contact: 'contatti',
+          privacy: 'privacy',
+          terms: 'termini'
+        }
+      }
+    }),
   ],
   output: 'static',
   build: {