Added if_solutions methods

Reviewed-on: #5
Co-authored-by: Mark <mark@betalupi.com>
Co-committed-by: Mark <mark@betalupi.com>

lib/typst/local/handout/0.1.0/handout.typ

@@ -137,7 +137,11 @@
   }
 }
 
-#let notsolution(content) = {
+#let if_solutions(content) = {
+  if show_solutions { content }
+}
+
+#let if_no_solutions(content) = {
   if not show_solutions { content }
 }