Download page: make expandable sections use clickable mouse cursor

Suggested by Daniel E. Renfer, duck1123, on Twitter

Author: harding

_sass/page.scss

@@ -1068,3 +1068,7 @@ div.maintainers {
 .bg-blue {
 	background-color: $bg-blue;
 }
+
+details > summary {
+        cursor: pointer;
+}