Getstarted.md with wide codeblocks don't wrap or scroll

[cassiocassio]

The whole pane gets a horizontal scrollbar.

This is made obvious with Spicule's getstarted example:

Possible solutions include:

i. wrap within the codeblock ii. allow the codeblock to scroll itself (proposed vanilla solution)

https://github.com/vanilla-framework/vanilla-framework/issues/1986

iii. make the getstarted pane resizeable

[spencerbygraves]

As @anthonydillon suggests, scrolling horizontally within itself seems to be the common way to do it.

[clagom]

@anthonydillon Is this still relevant?