[Tour of Beam] [Task] Links in Tour of Beam theory should be clickable

[olehborysevych]

What needs to be done:

Links in Tour of Beam theory units should be clickable and opened in a new browser window.
Unit with links: https://apache-beam-testing.web.app/tour/go/introduction/beam-concepts/runner-concepts

Priority:

P3

Component:

tour-of-beam

[nausharipov]

.take-issue