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

public/robots.txt

@@ -0,0 +1,15 @@
+# Robots.txt para Tibia Trade
+User-agent: *
+Allow: /
+Disallow: /api/
+
+# Sitemap
+Sitemap: https://tibiatrade.evandro.dev.br/sitemap.xml
+
+# Crawl-delay para bots específicos
+User-agent: Googlebot
+Crawl-delay: 0
+
+User-agent: Bingbot
+Crawl-delay: 1
+