Remove outdated guides and references related to Ansible best practices, Gitea repository configuration, journald management, and XXXigCC deployment. Introduce a new playbook for reinstalling Nezha Agent, ensuring proper parameter validation and service management. Update documentation to reflect the latest practices and remove deprecated content.

examples/nezha_reinstall_vars.example.yml

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+# Nezha Agent 重装配置变量示例
+# 使用方法: ansible-playbook nezha_reinstall.yml -i inventory.ini -e @nezha_reinstall_vars.yml
+
+# 必填参数：客户端密钥
+nz_client_secret: "your_client_secret_here"
+
+# 可选参数：Nezha 服务端地址（默认值如下）
+nz_server: "dash.miner.vvvo.net:443"
+
+# 可选参数：是否启用 TLS（默认 true）
+nz_tls: true
+
+# 可选参数：安装脚本 URL（默认值如下）
+# install_script_url: "https://raw.githubusercontent.com/wangdefaa/nezha-agent/refs/heads/main/script/install.sh"