Switch codesandbox templates to vitepress

### Expected behavior

codesandbox templates should work with V4

### Current behavior

They don't want to import chart.js

### Reproducible sample

https://codesandbox.io/s/react-chartjs-2-chart-js-issue-template-forked-64m243

### Optional extra steps/info to reproduce

_No response_

### Possible solution

switching to VITE

https://github.com/reactchartjs/react-chartjs-2/issues/1110

https://github.com/reactchartjs/react-chartjs-2/commit/0f93ce870ba39a7cd7b911fee8f87d7d69f1ef54

### Context

_No response_

### chart.js version

4.0.1

### Browser name and version

_No response_

### Link to your project

_No response_