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

conf/site/node_modules/@babel/plugin-transform-react-jsx-source/README.md

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+# @babel/plugin-transform-react-jsx-source
+
+> Add a __source prop to all JSX Elements
+
+See our website [@babel/plugin-transform-react-jsx-source](https://babeljs.io/docs/en/next/babel-plugin-transform-react-jsx-source.html) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-transform-react-jsx-source
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-transform-react-jsx-source --dev
+```