Bug: External social media links open in same tab instead of new tab #211

Describe the bug

On the JSON Schema Tour website https://tour.json-schema.org
the social media icons (GitHub, Slack, X/Twitter, YouTube, LinkedIn) at the bottom of the page open external websites in the same browser tab.
This behavior disrupts the user experience because it navigates the user away from the learning content.

### Steps To Reproduce
1.Open the website: https://tour.json-schema.org
2. Scroll down to the bottom of the page.
3. Locate the "Join the Community" section.
4. Click on any social media icon (for example, GitHub).

### Expected Behavior
External social media links should open in a new browser tab so that users can keep the JSON Schema Tour page open and continue learning without losing their current context.

Screenshots