docs: update redirect rules order (#1028)

Author: chenjiahan

website/docs/public/netlify.toml

@@ -1,11 +1,11 @@
-[[redirects]]
-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
+
+[[redirects]]
+from = "/*"
+to = "/404.html"
+status = 404