docs: add GitHub CLI explanation to prerequisites

[Copilot]

The prerequisites section assumed familiarity with GitHub CLI, which absolute beginners may not have.

Changes

• Prerequisites section (docs/src/content/docs/setup/quick-start.md)
  • Added command name (gh) for immediate recognition
  • Explained GitHub CLI as "a command-line tool for GitHub operations"
  • Clarified installation link with "Install here" call-to-action
  • Preserved version and authentication requirements

Before:

- ✅ **[GitHub CLI](https://cli.github.com/)** v2.0.0+ installed and authenticated (`gh auth login`)

After:

- ✅ **GitHub CLI** (`gh`) - A command-line tool for GitHub operations. [Install here](https://cli.github.com) v2.0.0+ and authenticate with `gh auth login`

Helps beginners understand what GitHub CLI is and where to get it without hunting through documentation.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[plan] Add GitHub CLI explanation to prerequisites section</issue_title>
<issue_description>## Objective

Add a brief explanation of what the GitHub CLI is in the prerequisites section to help absolute beginners.

Context

The documentation assumes users know what "GitHub CLI" is, but absolute beginners may not understand it's a command-line tool or where to get it.

Implementation

In the prerequisites section, change:

Before:

**GitHub CLI** - Required for installation

After:

**GitHub CLI** (`gh`) - A command-line tool for GitHub operations. [Install here](https://cli.github.com)

Files to Update

• docs/src/content/docs/guides/quick-start.md (prerequisites section)
• Any other pages that list prerequisites

Acceptance Criteria

• GitHub CLI is explained as a "command-line tool"
• Link to installation page (https://cli.github.com) included
• Command name (gh) is mentioned
• Explanation is concise (one sentence)

AI generated by Plan Command for discussion #7874

Comments on the Issue (you are @copilot in this section)

• Fixes [plan] Add GitHub CLI explanation to prerequisites section #7928

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