Events index page

### Description

Create a page on our site similar to the webinars page, but for events.
It should list all past and future events we’ve planned.

For the first iteration, the page can be a simple list (non-interactive), since currently only the Hannover Messe 2025 page exists. As we create dedicated pages for future events, we can link them from this index page.

### Epic/Story

_No response_

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate