Upgrade mdx parser

crates/service/service-webpage/src/pages/handouts.md

@@ -6,23 +6,26 @@ slug = "handouts"
 
 # Mark's Handouts
 
-[ORMC]: https://circles.math.ucla.edu/circles
 
-This page lists all the handouts I've written for my classes at the [ORMC],
+This page lists all the handouts I've written for my classes at the
+{{external("ORMC", "https://circles.math.ucla.edu/circles")}},
 arguably the best math circle in the western world. We teach students mathematics
-far beyond the regular school curriculum, much like [AOPS](https://artofproblemsolving.com)
-and the [BMC](https://mathcircle.berkeley.edu).
+far beyond the regular school curriculum, much like
+{{external("AOPS", "https://artofproblemsolving.com")}}
+and the
+{{external("BMC", "https://mathcircle.berkeley.edu")}}
+
 
 <br></br>
 
-{style(color_var:pink) For my students: } \
+{{color(--pink, "For my students:")}} \
 Don't look at solutions we haven't discussed,
 and don't start any handouts before class. That spoils all the fun!
 
-{style(color_var:green) For everyone else:} \
+{{color(--green, "For everyone else:")}} \
 If you're using any of these, please let me know---especially \
 if you find errors, mistakes, or a poorly designed section. \
-Such things must be fixed! { include(email_beta) }
+Such things must be fixed! {{ include(email_beta) }}
 
 <br></br>
 
@@ -33,8 +36,10 @@ are written with this in mind.\
 I do not expect the average student to finish all problems during this two-hour session.
 If the class finishes early, the lesson is either too short or too easy.
 
-The sources for all these handouts are available [here](https://git.betalupi.com/mark/handouts).\
-Some are written in LaTeX, some are in [Typst](https://typst.app). \
+The sources for all these handouts are available
+{{external("here", "https://git.betalupi.com/mark/handouts")}} \
+Some are written in LaTeX, some are in
+{{external("Typst", "https://typst.app")}}. \
 The latter is vastly superior.
 
 <br></br>