zenno/spurt: calculator for last spurt speed

zenno/src/routes/+page.svelte

@@ -18,6 +18,10 @@
 		<a href={resolve('/vet')}>My Veterans</a> — <i>Not yet implemented</i> — Set up and track your veterans for Zenno Rob Roy's inspiration
 		and spark calculators.
 	</li>
+	<li>
+		<a href={resolve('/spurt')}>Spurt Speed</a> — Calculate a horse's target speed in the last spurt and compare to other distance aptitudes
+		and running styles.
+	</li>
 	<li>
 		<a href={resolve('/convo')}>Lobby Conversations</a> — Check participants in lobby conversations and get recommendations on unlocking
 		them quickly.