[BUG] prefetch 404 error on Slack invite link (Next.js routing bug)

### Describe the bug.

The "Join Slack" link (pointing to `/slack-invite`) triggers a `404 Not Found` error in the browser console when hovered over or rendered.

### Expected behavior

The link should navigate to the Slack invitation URL without triggering internal Next.js prefetch errors.

### Screenshots

### How to Reproduce

1. Go to the homepage.
2. Open the Browser Console (F12).
3. Observe the network error: `GET /_next/data/.../slack-invite.json 404 (Not Found)`.

### 🖥️ Device Information [optional]

- Operating System (OS): Windows
- Browser: Chrome
- Browser Version: Latest

### 👀 Have you checked for similar open issues?

- [x] I checked and didn't find similar issue

### 🏢 Have you read the Contributing Guidelines?

- [x] I have read the [Contributing Guidelines](https://github.com/asyncapi/.github/blob/master/CONTRIBUTING.md)

### Are you willing to work on this issue ?

Yes I am willing to submit a PR!

Start at the homepage and inspect the “Join Slack” link pointing to /slack-invite, then reproduce the issue with the browser console open. Trace how the Next.js link is handled and verify that the Slack invitation URL opens without a GET /_next/data/.../slack-invite.json 404 error.

Written by the indexing model from the issue text.