Fix homepage links in staging

[andrezero]

How to Reproduce

• Navigate to a staging deployment on any PR (example)
• Click on any of the action s in the Hero section

What happens

• Navigates to /slug => 404

What should happen

• Navigates to /pr-xxx/slug

• Navigates to

Fix

The processLinks rehype plugin must rewrite links in frontmatter.hero.actions as well