create redirect from federalist to pages

[amirbey]

User Story

A user should be able to visit federalistapp links and reach the pages app.

Background (Optional)

Acceptance Criteria

• [ ] federalistapp-staging.18f.gov/* redirects to app.pages-staging.cloud.gov/*
• [ ] federalistapp.18f.gov/* redirects to app.pages.cloud.gov/*
• [ ] redirect federalist.18f.gov/* to cloud.gov/pages/*
• [ ] Change made live via pages-redirects

After evaluating, edit this part:

Level of effort - Low

Implementation outline (if higher than "low" effort):

• [ ] <TODO>