docs: update command

Author: antfu

docs/guide/work-with-ai.md

@@ -11,7 +11,7 @@ Slidev provides official [skills](https://code.claude.com/docs/en/skills) for AI
 Install the Slidev skill to your AI coding agent:
 
 ```bash
-npx add-skill slidevjs/slidev
+npx skills add slidevjs/slidev
 ```
 
 The source code of the skill is [here](https://github.com/slidevjs/slidev/tree/main/skills/slidev).

skills/slidev/README.md

@@ -5,7 +5,7 @@ Agent skills that help Claude Code understand and work with [Slidev](https://sli
 ## Installation
 
 ```bash
-npx add-skill slidevjs/slidev
+npx skills add slidevjs/slidev
 ```
 
 This will add the Slidev skill to your Claude Code configuration.