#7401925 Goals Capture: Fix page title on Goals Capture screen

Proposed Changes

This PR fixes the page title on Goals Capture step. It uses the DocumentHead component to make that change during render. The PR also splits the header text in order to reuse the “What are your goals?” string/translations in the page title.

Testing Instructions

1. Go to http://calypso.localhost:3000/setup/goals?siteSlug=YOUR-SITE
2. Verify if the page/tab title changes to “What are your goals? — WordPress.com”
3. Navigate to Import your site content and check if the title changed to “Import your site content”
4. Click on Back button and wait for the Goals Capture screen to be loaded
5. Check if the page title changed to “What are your goals? — WordPress.com” again