Scenario Bundles: Link to study report should open in new tab

[han-f]

Description of the issue

To make the nature of a an external publication explicit, I suggest to let links to external publication open in a new tab and to add the icon that indicates it is an external link.

This is the area I mean:

And this is the icon I refer to (not with blue background of course):

Ideas of solution

Describe possible ideas for solution and evaluate advantages and disadvantages.

Workflow checklist

• [ ] I am aware of the workflow in CONTRIBUTING.md

cc @wingechr @l-emele @stap-m