docs: update README and assets for new SSH agent workflow

- Replace the ssh workflow image with a new ssh agent image across all language versions of the README
- Add a link to related presentation slides in the README files
- Remove the old ssh-workflow.png image and add a new ssh-agent.png image to the repository

Signed-off-by: appleboy <appleboy.tw@gmail.com>

README.md

@@ -45,11 +45,13 @@ English | [繁體中文](./README.zh-tw.md) | [简体中文](./README.zh-cn.md)
 **SSH for GitHub Actions** is a powerful [GitHub Action](https://github.com/features/actions) for executing remote SSH commands easily and securely in your CI/CD workflows.  
 Built with [Golang](https://go.dev) and [drone-ssh](https://github.com/appleboy/drone-ssh), it supports a wide range of SSH scenarios, including multi-host, proxy, and advanced authentication.
 
-![ssh workflow](./images/ssh-workflow.png)
+![ssh workflow](./images/ssh-agent.png)
 
 [![testing main branch](https://github.com/appleboy/ssh-action/actions/workflows/main.yml/badge.svg)](https://github.com/appleboy/ssh-action/actions/workflows/main.yml)
 [![Trivy Security Scan](https://github.com/appleboy/ssh-action/actions/workflows/trivy-scan.yml/badge.svg)](https://github.com/appleboy/ssh-action/actions/workflows/trivy-scan.yml)
 
+**Slides:** [SSH for GitHub Actions](https://speakerdeck.com/appleboy/ssh-for-github-actions)
+
 ---
 
 ## 🧩 Core Concepts & Input Parameters

README.zh-cn.md

@@ -45,11 +45,13 @@
 **SSH for GitHub Actions** 是一个强大的 [GitHub Action](https://github.com/features/actions)，可让你在 CI/CD 工作流中轻松且安全地执行远程 SSH 命令。  
 本项目基于 [Golang](https://go.dev) 和 [drone-ssh](https://github.com/appleboy/drone-ssh) 构建，支持多主机、代理、高级认证等多种 SSH 场景。
 
-![ssh workflow](./images/ssh-workflow.png)
+![ssh workflow](./images/ssh-agent.png)
 
 [![testing main branch](https://github.com/appleboy/ssh-action/actions/workflows/main.yml/badge.svg)](https://github.com/appleboy/ssh-action/actions/workflows/main.yml)
 [![Trivy Security Scan](https://github.com/appleboy/ssh-action/actions/workflows/trivy-scan.yml/badge.svg)](https://github.com/appleboy/ssh-action/actions/workflows/trivy-scan.yml)
 
+**幻灯片：** [SSH for GitHub Actions](https://speakerdeck.com/appleboy/ssh-for-github-actions)
+
 ---
 
 ## 🧩 核心概念与输入参数

README.zh-tw.md

@@ -45,11 +45,13 @@
 **SSH for GitHub Actions** 是一個強大的 [GitHub Action](https://github.com/features/actions)，可讓你在 CI/CD 工作流程中輕鬆且安全地執行遠端 SSH 指令。  
 本專案以 [Golang](https://go.dev) 和 [drone-ssh](https://github.com/appleboy/drone-ssh) 建立，支援多主機、代理、進階認證等多種 SSH 場景。
 
-![ssh workflow](./images/ssh-workflow.png)
+![ssh workflow](./images/ssh-agent.png)
 
 [![testing main branch](https://github.com/appleboy/ssh-action/actions/workflows/main.yml/badge.svg)](https://github.com/appleboy/ssh-action/actions/workflows/main.yml)
 [![Trivy Security Scan](https://github.com/appleboy/ssh-action/actions/workflows/trivy-scan.yml/badge.svg)](https://github.com/appleboy/ssh-action/actions/workflows/trivy-scan.yml)
 
+**簡報：** [SSH for GitHub Actions](https://speakerdeck.com/appleboy/ssh-for-github-actions)
+
 ---
 
 ## 🧩 核心概念與輸入參數