feat: add remote app functionality and environment configuration

- Introduced a new HTML file for the light code demo.
- Added TypeScript definitions for environment variables.
- Implemented remote app logic for both browser and node environments.
- Configured Vite to load environment variables and define KEVISUAL_TOKEN.
- Updated README with relevant information about the project structure and usage.

.env.example

@@ -0,0 +1,2 @@
+# KEVISUAL_TOKEN=your_token_here
+KEVISUAL_TOKEN=st_g1fdlzmftb0dj44k3c0vusnqrfc5kk69