Revert "Add yet-another-react-lightbox package and update .gitignore to exclude node_modules"

This reverts commit c92f4a5edd.

frontend/node_modules/lodash.merge/README.md

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+# lodash.merge v4.6.2
+
+The [Lodash](https://lodash.com/) method `_.merge` exported as a [Node.js](https://nodejs.org/) module.
+
+## Installation
+
+Using npm:
+```bash
+$ {sudo -H} npm i -g npm
+$ npm i --save lodash.merge
+```
+
+In Node.js:
+```js
+var merge = require('lodash.merge');
+```
+
+See the [documentation](https://lodash.com/docs#merge) or [package source](https://github.com/lodash/lodash/blob/4.6.2-npm-packages/lodash.merge) for more details.