Tweaked gitignore

gitignore removed all composer and npm files, so automated builds would fail

conf/site/node_modules/collect.js/docs/api/split.md

@@ -0,0 +1,13 @@
+# `split()`
+
+The split method breaks a collection into the given number of groups:
+
+```js
+const collection = collect([1, 2, 3, 4, 5]);
+
+const groups = collection.split(3);
+
+// [[1, 2], [3, 4], [5]]
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/split.js)