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

frontend/node_modules/eslint/messages/shared.js

@@ -1,18 +0,0 @@
-/**
- * @fileoverview Shared utilities for error messages.
- * @author Josh Goldberg
- */
-
-"use strict";
-
-/**
- * Converts a value to a string that may be printed in errors.
- * @param {any} value The invalid value.
- * @param {number} indentation How many spaces to indent
- * @returns {string} The value, stringified.
- */
-function stringifyValueForError(value, indentation) {
-    return value ? JSON.stringify(value, null, 4).replace(/\n/gu, `\n${" ".repeat(indentation)}`) : `${value}`;
-}
-
-module.exports = { stringifyValueForError };