feat: add SEO and sitemap functionality

- Implemented robots.txt to guide search engine indexing.
- Created layout components for the selector and series pages to manage metadata.
- Developed a dynamic sitemap generator based on existing series and frameworks data.
- Centralized SEO information in a new lib/seo.js file to maintain consistency across the site.
- Added SVG logos for branding.

app/robots.js

@@ -0,0 +1,20 @@
+import { SITE } from "@/lib/seo";
+
+/**
+ * robots.txt. O essencial aqui é apontar o sitemap: é assim que o Google
+ * descobre as páginas de série sem depender de rastrear link por link.
+ */
+export default function robots() {
+	return {
+		rules: [
+			{
+				userAgent: "*",
+				allow: "/",
+				// A rota de API só serve ao marketplace e não tem conteúdo indexável.
+				disallow: ["/api/"],
+			},
+		],
+		sitemap: `${SITE.url}/sitemap.xml`,
+		host: SITE.url,
+	};
+}