Add redirect from root to external documentation

Author: peterp

docs/netlify.toml

@@ -4,6 +4,11 @@
   command = "yarn build"
   ignore = "node ignore_build.mjs"
 
+[[redirects]]
+  from = "/"
+  to = "https://docs.rwsdk.com"
+  status = 301
+
 [[redirects]]
   from = "/docs"
   to = "/docs/introduction"