Add PowerShell config in shiki for 'Install on Windows using Package Manager' page

[joonshakya]

URL:

https://nodejs.org/en/download/package-manager

Browser Name:

Chrome

Browser Version:

103.0.5060.134

Operating System:

Windows 10, 21H2, 19044.1826

How to reproduce the issue:

1. I went to the Node.js home page and clicked install via package managers link.
2. In download using package manager screen, I selected Install Node.js v20.11.1 (LTS) on Windows using Chocolatey.
3. In the shiki code snippet I saw language as Bash instead of PowerShell, which was the shell being used.