[HTML/CSS] Additional readability resource about teaching-materials

[trucnguyen]

The link already exists but redirects to another page presumably because Smashing's CMS changed.

We should update the link directly to redirect URL: https://www.smashingmagazine.com/2013/02/using-white-space-for-readability-in-html-and-css/

[brendajin]

@trucnguyen can you specify where this link should go?

[trucnguyen]

@brendajin We should update the link directly to here: https://www.smashingmagazine.com/2013/02/using-white-space-for-readability-in-html-and-css/

[brendajin]

file: htmlcss-1day/html-basics/slides.html

[MistyReed]

Link update already completed.