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

This reverts commit c92f4a5edd.

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

@@ -0,0 +1,17 @@
+/**
+ * @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);
+    }
+}