docs: shrink navbar logo and use white-on-black favicon

Reduce the Codegen mark in the wordmark from size-7 to size-5 so it sits
better next to the text. Switch the favicon background from blue to black
(white mark on black) and wire it into the site metadata so it actually
renders in the browser tab.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: jayhack

docs/favicon.svg

@@ -7,6 +7,9 @@ export const metadata: Metadata = {
 	description:
 		"Write Python programs that understand and safely edit whole codebases.",
 	metadataBase: new URL("https://graph-sitter.com"),
+	icons: {
+		icon: [{ url: "/favicon.svg", type: "image/svg+xml" }],
+	},
 	openGraph: {
 		title: "Graph-sitter",
 		description:

site/app/layout.tsx

@@ -4,7 +4,7 @@ export function Logo({ className }: { className?: string }) {
 	return (
 		<svg
 			viewBox="0 0 80.87 80.87"
-			className={cn("size-7 text-foreground", className)}
+			className={cn("size-5 text-foreground", className)}
 			fill="currentColor"
 			aria-hidden="true"
 		>