Local development via NPM not working

according to README:

```bash
npm i
npm run dev
```

Environment:
- Fedora 40
- NodeJS v21.6.2


Error:
```bash
Error: Loading PostCSS Plugin failed: Cannot find module 'tailwindcss'
Require stack:
- /path/to/convoy/postcss.config.js
```

Expected:
Vitepress should run


Side node: NPM packages are outdated in `package.json`