Clean up unnecessary migration files and outdated documentation

jest.setup.js

@@ -3,4 +3,22 @@ import '@testing-library/jest-dom'
 // Add TextEncoder/TextDecoder globals for Node.js environment
 const { TextEncoder, TextDecoder } = require('util');
 global.TextEncoder = TextEncoder;
-global.TextDecoder = TextDecoder;
+global.TextDecoder = TextDecoder;
+
+// Mock axios globally
+jest.mock('axios', () => ({
+  create: jest.fn(() => ({
+    get: jest.fn(),
+    post: jest.fn(),
+    put: jest.fn(),
+    delete: jest.fn(),
+    interceptors: {
+      request: {
+        use: jest.fn()
+      },
+      response: {
+        use: jest.fn()
+      }
+    }
+  }))
+}))