Assistant: Use frames instead of big buttons in router

Originally created by @sajolida on #9559 (Redmine)

So far we had in the router big buttons with all the content describing the corresponding option. Let’s try to have frames instead with only a small button to choose it. The content of these buttons can then make it clear that it’s the end of the router (when it is).

Feature Branch: web/9559-small-buttons

Parent Task: #9445 (closed)