Remove unused files and update index and sidebar. (#19479)

docs/cli/index.md

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-# Using Gemini CLI
-
-Gemini CLI is a terminal-first interface that brings the power of Gemini AI
-models directly into your development workflow. It lets you interact with AI
-using your local files, shell environment, and project context, creating a
-bridge between generative AI and your system tools.
-
-## User guides
-
-These guides provide step-by-step instructions and practical examples for using
-Gemini CLI in your daily development workflow.
-
-- **[Quickstart](../get-started/index.md):** Get up and running with Gemini CLI
-  in minutes.
-- **[Examples](../get-started/examples.md):** See practical examples of Gemini
-  CLI in action.
-- **[Get started with skills](./tutorials/skills-getting-started.md):** Learn
-  how to use and manage specialized expertise.
-- **[File management](./tutorials/file-management.md):** How to include, search,
-  and modify local files.
-- **[Set up an MCP server](./tutorials/mcp-setup.md):** Configure Model Context
-  Protocol servers for custom tools.
-- **[Manage context and memory](./tutorials/memory-management.md):** Manage
-  persistent instructions and individual facts.
-- **[Manage sessions and history](./tutorials/session-management.md):** Resume,
-  manage, and rewind your conversations.
-- **[Execute shell commands](./tutorials/shell-commands.md):** Execute system
-  commands safely directly from your prompt.
-- **[Plan tasks with todos](./tutorials/task-planning.md):** Using todos for
-  complex, multi-step agent requests.
-- **[Web search and fetch](./tutorials/web-tools.md):** Searching and fetching
-  content from the web.
-
-## Features
-
-Technical reference documentation for each capability of Gemini CLI.
-
-- **[/about](../cli/commands.md#about):** Show version info.
-- **[/auth](../cli/commands.md#auth):** Change authentication method.
-- **[/bug](../cli/commands.md#bug):** File an issue about Gemini CLI.
-- **[/chat](../cli/commands.md#chat):** Save and resume conversation history.
-- **[/clear](../cli/commands.md#clear):** Clear the terminal screen.
-- **[/compress](../cli/commands.md#compress):** Replace context with a summary.
-- **[/copy](../cli/commands.md#copy):** Copy output to clipboard.
-- **[/directory](../cli/commands.md#directory-or-dir):** Manage workspace
-  directories.
-- **[/docs](../cli/commands.md#docs):** Open documentation in browser.
-- **[/editor](../cli/commands.md#editor):** Select preferred editor.
-- **[/extensions](../cli/commands.md#extensions):** List active extensions.
-- **[/help](../cli/commands.md#help-or):** Display help information.
-- **[/hooks](../hooks/index.md):** Manage hooks for lifecycle events.
-- **[/ide](../ide-integration/index.md):** Manage IDE integration.
-- **[/init](../cli/commands.md#init):** Create a GEMINI.md context file.
-- **[/mcp](../tools/mcp-server.md):** Manage Model Context Protocol servers.
-- **[/memory](../cli/commands.md#memory):** Manage instructional context.
-- **[/model](./model.md):** Choose Gemini model.
-- **[/policies](../cli/commands.md#policies):** Manage security policies.
-- **[/privacy](../cli/commands.md#privacy):** Display privacy notice.
-- **[/quit](../cli/commands.md#quit-or-exit):** Exit Gemini CLI.
-- **[/restore](../cli/commands.md#restore):** Restore file state.
-- **[/resume](../cli/commands.md#resume):** Browse and resume sessions.
-- **[/rewind](./rewind.md):** Navigate backward through history.
-- **[/settings](./settings.md):** Open settings editor.
-- **[/setup-github](../cli/commands.md#setup-github):** Set up GitHub Actions.
-- **[/shells](../cli/commands.md#shells-or-bashes):** Toggle background shells
-  view.
-- **[/skills](./skills.md):** Manage Agent Skills.
-- **[/stats](../cli/commands.md#stats):** Display session statistics.
-- **[/terminal-setup](../cli/commands.md#terminal-setup):** Configure
-  keybindings.
-- **[/theme](./themes.md):** Change visual theme.
-- **[/tools](../cli/commands.md#tools):** Display list of available tools.
-- **[/vim](../cli/commands.md#vim):** Toggle vim mode.
-- **[Activate skill (tool)](../tools/activate-skill.md):** Internal mechanism
-  for loading expert procedures.
-- **[Ask user (tool)](../tools/ask-user.md):** Internal dialog system for
-  clarification.
-- **[Checkpointing](./checkpointing.md):** Automatic session snapshots.
-- **[File system (tool)](../tools/file-system.md):** Technical details for local
-  file operations.
-- **[Headless mode](./headless.md):** Programmatic and scripting interface.
-- **[Internal documentation (tool)](../tools/internal-docs.md):** Technical
-  lookup for CLI features.
-- **[Memory (tool)](../tools/memory.md):** Storage details for persistent facts.
-- **[Model routing](./model-routing.md):** Automatic fallback resilience.
-- **[Plan mode (experimental)](./plan-mode.md):** Use a safe, read-only mode for
-  planning complex changes.
-- **[Sandboxing](./sandbox.md):** Isolate tool execution.
-- **[Shell (tool)](../tools/shell.md):** Detailed system execution parameters.
-- **[Telemetry](./telemetry.md):** Usage and performance metric details.
-- **[Todo (tool)](../tools/todos.md):** Progress tracking specification.
-- **[Token caching](./token-caching.md):** Performance optimization.
-- **[Web fetch (tool)](../tools/web-fetch.md):** URL retrieval and extraction
-  details.
-- **[Web search (tool)](../tools/web-search.md):** Google Search integration
-  technicals.
-
-## Configuration
-
-Settings and customization options for Gemini CLI.
-
-- **[Custom commands](./custom-commands.md):** Personalized shortcuts.
-- **[Enterprise configuration](./enterprise.md):** Professional environment
-  controls.
-- **[Ignore files (.geminiignore)](./gemini-ignore.md):** Exclusion pattern
-  reference.
-- **[Model configuration](./generation-settings.md):** Fine-tune generation
-  parameters like temperature and thinking budget.
-- **[Project context (GEMINI.md)](./gemini-md.md):** Technical hierarchy of
-  context files.
-- **[Settings](./settings.md):** Full `settings.json` schema.
-- **[System prompt override](./system-prompt.md):** Instruction replacement
-  logic.
-- **[Themes](./themes.md):** UI personalization technical guide.
-- **[Trusted folders](./trusted-folders.md):** Security permission logic.
-
-## Next steps
-
-- Explore the [Command reference](./commands.md) to learn about all available
-  slash commands.
-- Read about [Project context](./gemini-md.md) to understand how to provide
-  persistent instructions to the model.
-- See the [CLI reference](./cli-reference.md) for a quick cheatsheet of flags.