feat: Add Markdown View Plugin with React and Chakra UI

- Implemented main application structure with App and View components.
- Integrated React Markdown for rendering Markdown content.
- Added API function to fetch Markdown content from the backend.
- Created a custom Chakra UI theme to align with Airflow's design.
- Configured Vite for building the application with appropriate asset paths.
- Included a sample Markdown file for initial content display.
- Set up TypeScript configuration for better development experience.

markdown_view_plugin/ui/vite.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [react()],
+  base: '/markdown_view_plugin_mount/static/markdown_view_plugin/', // Important for Airflow to find assets
+  build: {
+    outDir: 'dist',
+    rollupOptions: {
+      output: {
+        entryFileNames: 'assets/[name].js',
+        chunkFileNames: 'assets/[name].js',
+        assetFileNames: 'assets/[name].[ext]',
+      },
+    },
+  },
+})