[bot] Add Vim mode documentation to course

[DanWahlin]

Summary

Document the new Vim mode feature (/vim command) added in Copilot CLI v1.0.84-2 (released Sept 8, 2026) to help learners discover this modal editing capability.

Changes Made

Chapter 01: First Steps

• File: 01-setup-and-first-steps/README.md
• Section: Additional Commands > Display
• What: Added /vim command documentation with beginner-friendly explanation
• Why: The vim mode feature is now available to all users and should be documented for those who prefer vim keybindings in the prompt composer

What New Features Were Found

Copilot CLI v1.0.84-5 through v1.0.83 (Sept 4-14, 2026):

1. Vim mode (v1.0.84-2, Sept 8) ✅ UPDATED IN THIS PR

   • New /vim command for modal editing
   • Allows typing prompts using vim keybindings (hjkl navigation, insert modes)
   • Available to all users
   • Documented in this PR

2. Command reorganization (v1.0.84-4, Sept 10)

   • New: copilot instruction list and copilot lsp list terminal commands
   • New: enable/disable subcommands for copilot plugin/mcp/skill
   • Deprecated: Cross-kind --kind, --scope flags from old copilot plugins
   • Status: These are documented separately in their respective chapters (Ch 04, 05, 06)

3. Session and memory import (v1.0.84-5, Sept 11)

   • New session/memory import commands for semantic JSONL interchange format
   • Advanced feature - not prioritized for beginner course

Why These Updates

• The course targets beginners, so only user-facing, beginner-friendly features are included
• Vim mode is a discoverable feature that terminal users will appreciate
• Command reorganization (instruction list, lsp list) are less beginner-focused and documented in advanced chapters

Testing

• Verified /vim command syntax and functionality from v1.0.84-2 release notes
• Documentation aligns with existing command reference style in Chapter 01
• All links and cross-references remain functional

Related

• Official release: https://github.com/github/copilot-cli/releases/tag/v1.0.84-2
• Copilot CLI documentation: https://docs.github.com/copilot/reference/cli-command-reference

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