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

frontend/node_modules/eslint-scope/lib/assert.js

@@ -1,17 +0,0 @@
-/**
- * @fileoverview Assertion utilities.
- * @author Nicholas C. Zakas
- */
-
-/**
- * Throws an error if the given condition is not truthy.
- * @param {boolean} condition The condition to check.
- * @param {string} message The message to include with the error.
- * @returns {void}
- * @throws {Error} When the condition is not truthy.
- */
-export function assert(condition, message = "Assertion failed.") {
-    if (!condition) {
-        throw new Error(message);
-    }
-}