Configure 301 redirect from strategy.data.gov to resources.data.gov

## Summary

Configure a permanent 301 redirect so that all strategy.data.gov traffic lands on resources.data.gov.

## Background

`strategy.data.gov` is being retired. All content dependencies in resources.data.gov must be resolved before this redirect goes live (Tickets 2-5). The redirect is a Cloud.gov Pages / Federalist configuration change in the `GSA/data-strategy` repo.

## Task

- [ ] Confirm Tickets 2, 3, 4, and 5 are all closed
- [ ] Configure a 301 redirect from `strategy.data.gov` (all paths) to `resources.data.gov` in the `GSA/data-strategy` repo
- [ ] Verify redirect behavior with `curl -I https://strategy.data.gov` and confirm `HTTP/2 301` and `location: https://resources.data.gov`
- [ ] Verify a deep path (e.g. `strategy.data.gov/action-plan/`) also redirects correctly

## Acceptance criteria

- [ ] `strategy.data.gov` returns 301 to `resources.data.gov`
- [ ] Redirect confirmed via curl or browser devtools
- [ ] No content remains accessible at `strategy.data.gov` paths

## Depends on

Tickets 2, 3, 4, 5