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.

src/pages/nl/about.astro

@@ -0,0 +1,32 @@
+---
+import BaseLayout from "../../layouts/BaseLayout.astro";
+import Header from "../../components/Header.astro";
+import Footer from "../../components/Footer.astro";
+import CTA from "../../components/CTA.astro";
+import { Trans } from "astro-i18next/components";
+import i18next from "i18next";
+
+// Initialize i18next for this page
+await i18next.changeLanguage("nl");
+---
+
+<BaseLayout 
+  title={`${i18next.t("nav.about")} | ${i18next.t("meta.title")}`}
+  description={i18next.t("meta.description")}
+  keywords={i18next.t("meta.keywords")}
+>
+  <Header />
+  <main>
+    <section class="py-20">
+      <div class="container-custom">
+        <h1 class="text-4xl font-bold mb-8">{i18next.t("about.title")}</h1>
+        <div class="prose prose-lg">
+          <p>{i18next.t("about.description")}</p>
+          <p>{i18next.t("about.mission")}</p>
+        </div>
+      </div>
+    </section>
+    <CTA />
+  </main>
+  <Footer />
+</BaseLayout>