Create a page template for event follow-ups

1. Change Summary

• Creates a new event page for "follow-up" content after an event.
• Content doc: https://docs.google.com/document/d/19xrWWeuFm2KDetW0M-yLWNxF5UAjCn8h63LKmQn7fLM/edit?tab=t.0
• to be added to decap after merging

[Provide concise steps to test the changes]

Review App

Production	Review app	Screenshot
NA	https://1493-events-follow-up.about.gitlab-review.app/events/follow-up/aws-summit-london/	Screenshot

3. Deployment Steps

[List key deployment steps or configurations]

Closes #1493 (closed)