Add brand.firefox.com redirect, IO-3544

[gcoxmoz]

Refractr PR Checklist

JIRA ticket: IO-3544

When creating a PR for Refractr, confirm you've done the following steps for a smooth CI and CD experience:

• Have you updated the relevant YAML in the PR?
• Have you checked the relevant YAML for any possible dupes regarding your domain?
• Have you checked if there are any TLS cert concerns - e.g. if the domain being redirected already exists, and it is being changed to point at refractr, is a temporary TLS 'outage' while waiting for certification via HTTP challenge okay? If not, add a note to the JIRA ticket.
• If desired, have you generated the nginx config manually to confirm updates work as expected?

After PR merge, next steps include:

• A merge to the main branch will automatically deploy refractr's stage environment -- deploying the prod environment requires a GitHub release to be created.
• Once deployed, refractr's certmap must be updated and DNS entries must be changed -- SRE can help with this. Please pull someone in on the JIRA ticket or ask for help in #sre on Slack.

[bkochendorfer]

I am like 95% sure this wants a trailing slash. If you run the tests locally with this change I'm guessing it will fail?

Suggested change

	- brand.mozilla.com/hub/26:
	- brand.mozilla.com/hub/26/:

[gcoxmoz]

Trying without the slash based on some prior-art above, and a handshake that I'll come crying if it turns out needed.