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

This reverts commit c92f4a5edd.

frontend/node_modules/eslint/lib/rules/no-sparse-arrays.js

@@ -0,0 +1,73 @@
+/**
+ * @fileoverview Disallow sparse arrays
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../shared/types').Rule} */
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "Disallow sparse arrays",
+            recommended: true,
+            url: "https://eslint.org/docs/latest/rules/no-sparse-arrays"
+        },
+
+        schema: [],
+
+        messages: {
+            unexpectedSparseArray: "Unexpected comma in middle of array."
+        }
+    },
+
+    create(context) {
+
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+
+            ArrayExpression(node) {
+                if (!node.elements.includes(null)) {
+                    return;
+                }
+
+                const { sourceCode } = context;
+                let commaToken;
+
+                for (const [index, element] of node.elements.entries()) {
+                    if (index === node.elements.length - 1 && element) {
+                        return;
+                    }
+
+                    commaToken = sourceCode.getTokenAfter(
+                        element ?? commaToken ?? sourceCode.getFirstToken(node),
+                        astUtils.isCommaToken
+                    );
+
+                    if (element) {
+                        continue;
+                    }
+
+                    context.report({
+                        node,
+                        loc: commaToken.loc,
+                        messageId: "unexpectedSparseArray"
+                    });
+                }
+            }
+
+        };
+
+    }
+};