Clean up expando code

Remove expando code not needed since switching to semantic <details><summary>

Author: 1j01

app.coffee

@@ -58,12 +58,6 @@ overlap_summary = document.getElementById("overlap-summary")
 overlap_details = document.getElementById("overlap-details")
 copied_indicator = document.getElementById("copied-to-clipboard")
 
-overlaps_expanded = false
-overlap_summary.addEventListener "click", ->
-overlaps_expanded = not overlaps_expanded
-overlap_details.style.display = if overlaps_expanded then "" else "none"
-overlap_summary.style.cursor = "pointer"
-
 output_text_art = ""
 update_output_area = ->
 if markdown_format_checkbox.checked

index.html

@@ -107,6 +107,10 @@
 opacity: 0;
 }
 
+details summary {
+cursor: pointer;
+}
+
 .two-column-layout {
 display: flex;
 flex-direction: column; /* i.e. NOT a two column layout */