Change redirects to 301 type
As per the discussion at https://gitlab.com/gitlab-com/marketing/inbound-marketing/growth/-/issues/1023#note_555040507, we are going to move to 301 redirects instead of 302.
As per the discussion at https://gitlab.com/gitlab-com/marketing/inbound-marketing/growth/-/issues/1023#note_555040507, we are going to move to 301 redirects instead of 302.