remove node_modules and .gitignore them

node_modules/ext/docs/string_/includes.md

@@ -1,10 +0,0 @@
-# `string.includes(position = 0)` _(ext/string\_/includes)_
-
-`includes` method for strings. Resolve native [includes](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes) if implemented, otherwise fallback to shim implementation.
-
-```javascript
-const includes = require("ext/string_/includes");
-
-includes.call("razdwa", "raz"); // true
-includes.call("razdwa", "trzy"); // false
-```