feat: customize README for Tibia Trade marketplace and enhance page accessibility

- Rewrote README.md to describe the Tibia Trade project, including features, setup instructions, technologies, and SEO keywords in Portuguese
- Removed "Pagodera" from thank you page text for rebranding
- Added role and aria-label to main element in home page for better accessibility
- Added metadata generation with localized titles and descriptions to prices page for improved SEO and user experience

app/sitemap.ts

@@ -0,0 +1,28 @@
+import { MetadataRoute } from "next";
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  const baseUrl = "https://tibiatrade.evandro.dev.br";
+  const locales = ["pt", "en"];
+  const pages = ["", "/market", "/sobre", "/precos", "/apoiar"];
+
+  const routes: MetadataRoute.Sitemap = [];
+
+  locales.forEach((locale) => {
+    pages.forEach((page) => {
+      routes.push({
+        url: `${baseUrl}/${locale}${page}`,
+        lastModified: new Date(),
+        changeFrequency: page === "" ? "daily" : "weekly",
+        priority: page === "" ? 1.0 : 0.8,
+        alternates: {
+          languages: {
+            pt: `${baseUrl}/pt${page}`,
+            en: `${baseUrl}/en${page}`,
+          },
+        },
+      });
+    });
+  });
+
+  return routes;
+}