tour: Terminal output lacks horizontal scroller

[mikeygough]

Context: https://go.dev/tour/methods/9

Hi! Occasionally the terminal output text is longer than the width of the terminal window but the container has no scroller. There's also no way to resize panes so it's difficult to read the full terminal output. For example:

tour-of-go-scroll.mov

One work-around is to highlight the text and drag, as demonstrated above. But can we instead add overflow: scroll to create a scrollbar? This makes it easier to read long terminal output. For example:

tour-of-go-scroll-fix.mov

Thank you!