Add Search To Emoji Page

This adds a typeahead search feature
for the very large emoji table. It filters as you type to find if an emoji exists or not.

The JavaScript could be adapted to work on all tables in the future.

docs/input/assets/js/emoji-search.js

@@ -0,0 +1,30 @@
+$(document).ready(function () {
+    let input = document.getElementById('emoji-search');
+    let table = document.getElementById('emoji-results');
+
+    input.onkeyup = function (event) {
+
+        if (event.key === "Enter") {
+            event.preventDefault();
+            event.stopPropagation();
+            return false;
+        }
+
+        let value = input.value.toUpperCase();
+        let rows = table.getElementsByClassName('emoji-row');
+
+        for (let i = 0; i < rows.length; i++) {
+            let row = rows[i];
+
+            let match =
+                new RegExp(value, "i").test(row.textContent) ||
+                value === '';
+
+            if (match) {
+                row.style.display = 'table-row';
+            } else {
+                row.style.display = 'none';
+            }
+        }
+    }; // keyup
+}); // ready