Revert npx skills install examples in README

Author: jackwener

README.md

@@ -130,8 +130,6 @@ bilibili-cli ships with a [`SKILL.md`](./SKILL.md) that teaches AI agents how to
 ### Claude Code / Antigravity
 
 ```bash
-npx skills add jackwener/bilibili-cli
-
 # Clone into your project's skills directory
 mkdir -p .agents/skills
 git clone git@github.com:jackwener/bilibili-cli.git .agents/skills/bilibili-cli
@@ -270,8 +268,6 @@ bilibili-cli 自带 [`SKILL.md`](./SKILL.md)，让 AI Agent 能自动学习并
 ### Claude Code / Antigravity
 
 ```bash
-npx skills add jackwener/bilibili-cli
-
 # 克隆到项目的 skills 目录
 mkdir -p .agents/skills
 git clone git@github.com:jackwener/bilibili-cli.git .agents/skills/bilibili-cli