Added PowerShell commands in the 'VS Code Extension Quick Start' section

[tnaum-ms]

This pull request introduces a reusable tab component to the codebase and refactors the documentation page to use it for displaying command-line instructions in multiple formats. The most notable changes are the addition of the new Tabs and TabPanel components and their integration into the documentation UI.

Closes documentdb/documentdb#299

New Tab Component Implementation:

• Added Tabs and TabPanel components in app/components/Tabs.tsx, enabling tabbed navigation for displaying different content sections.

Documentation Page Refactor:

• Updated app/docs/page.tsx to import and use the new Tabs and TabPanel components for presenting setup instructions.
• Refactored the "Creating a new DocumentDB instance" section to show Bash and PowerShell command examples in separate tabs, improving clarity and usability for users with different environments.

[xgerman]

@patty-chow please review