Well done on this. One thing I picked up was the markup of the quote at the end of the letter.
<blockquote> is generally used for extended quotation (see MDN), and does not add quotation marks. I think the more appropriate in this situation would have been using <q> instead such that your markup looks like
<p> University of Awesome motto: <q>Be awesome to each other.</q> -- <cite> The memoirs of Bill S Preston, <abbr title="Esquire">Esq</abbr></cite> </p>
<p>University of Awesome motto: <q cite="example.com">Be awesome to each other</q>. — <cite>The memoirs of Bill S Preston, <abbr title="Esquire">Esq</abbr></cite></p>
University of Awesome motto: Be awesome to each other. — The memoirs of Bill S Preston, Esq
I accept the blame. I used <blockquote> because it looked better in comparison.
It’s more of an artistic choice than a technical one.