feat: implement WYSIWYG markdown editor with Go backend and React frontend

frontend/jest.config.js

@@ -0,0 +1,11 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'jsdom',
+  transformIgnorePatterns: [
+    "node_modules/(?!(react-markdown|@mui)/)",
+  ],
+  setupFilesAfterEnv: ['<rootDir>/src/setupTests.ts'],
+  moduleNameMapper: {
+    '\.(css|less|scss|sass)$': 'identity-obj-proxy',
+  },
+};