add proper redirect

docs/public/_redirects

@@ -6,8 +6,8 @@
 
 /size-snapshot https://s3.eu-central-1.amazonaws.com/mui-org-ci/artifacts/master/latest/size-snapshot.json 200
 
-# To add when we finish work on v6
-# https://next.mui.com/* https://mui.com/:splat 301!
+# To comment when we start working on v6
+https://next.mui.com/* https://mui.com/:splat 302!
 
 # For links that we can't edit later on, e.g. hosted in the code published on npm
 /r/styles-instance-warning /material-ui/getting-started/faq/#i-have-several-instances-of-styles-on-the-page 302
@@ -417,5 +417,3 @@ https://v4.material-ui.com/* https://v4.mui.com/:splat 301!
 /toolpad/_next/* https://mui-toolpad-docs.netlify.app/_next/:splat 200
 /toolpad/* https://mui-toolpad-docs.netlify.app/toolpad/:splat 200
 /r/toolpad-* https://mui-toolpad-docs.netlify.app/r/toolpad-:splat 200
-
-/* https://mui.com/:splat 302!