Merge pull request #3637 from telerik/feat/docs-demos-app

docs: add runnable documentation demos app

Author: Yanko-Georgiev

docs/.gitignore

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+node_modules/
+dist/
+.vite/
+*.local
+package-lock.json

docs/README.md

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+# KendoReact Documentation Demos
+
+Runnable demos extracted from the KendoReact documentation.
+
+**Version:** 14.4.0
+
+## Quick Start
+
+```bash
+npm install
+npm run dev
+```
+
+Then open [http://localhost:3030](http://localhost:3030) to browse all demos.
+
+## Requirements
+
+- Node.js 20+
+- A valid [KendoReact license](https://www.telerik.com/kendo-react-ui/pricing/)
+
+## Structure
+
+- `content/` — Documentation markdown, API docs, and demo source files
+- `main.tsx` — App entry point with auto-discovery of all demos
+- `vite.config.ts` — Vite configuration