restore JS examples, add luxon and jmespath to js, and add some clarifications and small updates

docs/code-examples/javascript-functions/split-binary-file-data.md

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+# Split binary file data into individual items
+
+If you receive more than one binary file from a node, you can split the binary data into individual items using the following code snippet.
+
+```js
+let results = [];
+
+for (item of items) {
+    for (key of Object.keys(item.binary)) {
+        results.push({
+            json: {
+                fileName: item.binary[key].fileName
+            },
+            binary: {
+                data: item.binary[key],
+            }
+        });
+    }
+}
+
+return results;
+```