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You can add a custom button to the main navigation bar, next to the logo. This button can lead to any URL of your choice. 

To add the button:

1. Go to Configuration > Advanced Configuration Options. 
2. Create a new option called 'extraNavigationHtml'. As a value enter an HTML code containing the <a href> tag. 
3. Save the option and refresh the application.

Image Modified

<a target="_blank" href="https://en.wikipedia.org"><div style="width:30px;height:30px; background-size: 30px 30px;
background-image:url(https://upload.wikimedia.org/wikipedia/en/8/80/Wikipedia-logo-v2.svg)" ></div></a>

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