docs: redirect lib.rsbuild.dev to rslib.rs (#1027)

Author: chenjiahan

website/docs/public/netlify.toml

@@ -2,3 +2,10 @@
 from = "/*"
 to = "/404.html"
 status = 404
+
+# Redirect lib.rsbuild.dev to rslib.rs
+[[redirects]]
+from = "https://lib.rsbuild.dev/*"
+to = "https://rslib.rs/:splat"
+status = 301
+force = true