docs: add CLI system docs

docs/en/skills/index.mdx

@@ -7,20 +7,17 @@ Skills provide infinite extensibility for the Agent. Each Skill consists of a de
 
 The difference between Skills and Tools: Tools are atomic operations implemented in code (e.g., file read/write, command execution), while Skills are high-level workflows based on description files that can combine multiple Tools to complete complex tasks.
 
-## Built-in Skills
+## Getting Skills
 
-Located in the project `skills/` directory, automatically enabled based on dependency conditions:
+CowAgent offers multiple ways to acquire skills:
 
-| Skill | Description | Dependencies |
-| --- | --- | --- |
-| [`skill-creator`](/en/skills/skill-creator) | Create custom skills through conversation | None |
-| [`openai-image-vision`](/en/skills/image-vision) | Recognize images using OpenAI vision models | `OPENAI_API_KEY` |
-| [`linkai-agent`](/en/skills/linkai-agent) | Integrate LinkAI platform agents | `LINKAI_API_KEY` |
-| [`web-fetch`](/en/skills/web-fetch) | Fetch web page text content | `curl` (enabled by default) |
+- **Cow Skill Hub** — Browse and install community skills via `/skill list --remote`
+- **GitHub** — Install directly from GitHub repositories, with batch install support
+- **ClawHub** — Install ClawHub skills via `/skill install clawhub:name`
+- **URL** — Install from zip archives or SKILL.md links
+- **Conversational creation** — Let the Agent create skills through natural language conversation
 
-## Custom Skills
-
-Created by users through conversation, stored in workspace (`~/cow/skills/`), can implement any complex business process and third-party system integration.
+See [Install Skills](/en/skills/install) and [Skill Management Commands](/en/commands/skill) for details. You can also [create skills](/en/skills/create) through conversation.
 
 ## Skill Loading Priority