add redirect for CORS guide

Author: kenjenkins

static/_redirects

@@ -215,6 +215,7 @@ https://docs.pomerium.io/* https://docs.pomerium.com/:splat 301!
 /docs/get-started/fundamentals/zero-single-sign-on.html /docs/get-started/fundamentals/zero/zero-single-sign-on
 /docs/get-started/fundamentals/zero-tcp-routes /docs/get-started/fundamentals/zero/zero-tcp-routes
 /docs/get-started/fundamentals/zero-tcp-routes.html /docs/get-started/fundamentals/zero/zero-tcp-routes
+/docs/guides/cors /docs/internals/troubleshooting#cross-origin-configuration
 /docs/guides/jwt-verification-with-envoy /docs/capabilities/getting-users-identity
 /docs/guides/kubernetes.html /docs/deploy/k8s/quickstart
 /docs/guides/nginx https://0-20-0.docs.pomerium.com/docs/guides/nginx 301!