build: don’t doubly emit `:` on context etc.!

eleventy/preparse.ts

···
 const ASSUMED_AUDIENCE =
    "<b><a href='https://v4.chriskrycho.com/2018/assumed-audiences.html'>Assumed audience</a>:</b>";
 
-const CONTEXT = '<b>A bit of context:</b>:';
+const CONTEXT = '<b>A bit of context:</b>';
 
 const EPISTEMIC_STATUS =
    "<b><a href='https://v5.chriskrycho.com/journal/epistemic-status/'>Epistemic status</a>:</b>";

site/_includes/components/book.njk

···
    </section>
    {% if book.review %}
       <section class='book-review__summary'>
-         <b>{{book.review.rating}}</b>:
+         <b>{{book.review.rating}}:</b>
          {{book.review.summary | safe}}
       </section>
    {% endif %}