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/view.md

@@ -0,0 +1,18 @@
+# Welcome to Markdown View Plugin!
+
+This is a sample `view.md` file.
+
+You can write **Markdown** here, and it will be rendered in the Airflow UI.
+
+## Features
+*   Supports standard Markdown syntax.
+*   Styled with Airflow's theme (hopefully!).
+
+### Example List
+1.  First item
+2.  Second item
+3.  Third item
+
+---
+
+Edit this file to change the content of your view.