Remove max-height constraint on sidenote numbers

Allow sidenote numbers to display at their natural height instead
of being constrained to 2rem.

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Co-Authored-By: Claude <noreply@anthropic.com>

kjvstudy_org/static/tufte.css

@@ -391,7 +391,6 @@ input.margin-toggle {
 
 label.sidenote-number {
     display: inline-block;
-    max-height: 2rem; /* should be less than or equal to paragraph line-height */
 }
 
 label.margin-toggle:not(.sidenote-number) {