Adding pervasive column sorting

app/static/css/style.css

@@ -247,6 +247,37 @@ h2 {
   gap: 0.4rem;
 }
 
+/* Sortable table headers */
+table.sortable thead th:not([data-sort-off]) {
+  cursor: pointer;
+  user-select: none;
+}
+
+table.sortable thead th:not([data-sort-off]):hover {
+  color: var(--text);
+}
+
+table.sortable thead th[aria-sort]::after {
+  margin-left: 0.3rem;
+}
+
+table.sortable thead th[aria-sort="ascending"]::after {
+  content: "\25B2";
+}
+
+table.sortable thead th[aria-sort="descending"]::after {
+  content: "\25BC";
+}
+
+.sort-link {
+  color: inherit;
+  text-decoration: none;
+}
+
+.sort-link:hover {
+  text-decoration: underline;
+}
+
 /* Tags / definition lists */
 .tag {
   display: inline-block;