fix: align display math

doerg/resources/net/deertopia/doerg/tuftesque.css

@@ -546,3 +546,13 @@ figure.fullwidth figcaption {
 .latex-fragment
 { fill: currentColor
 }
+
+.latex-fragment.display-math
+{ display: block
+; width: 55%
+/* Center it — do we want to do that? */
+; align-items: center
+; justify-content: center
+; display: flex
+; max-width: 55%
+}