docs: add animation reference

[HardyNLee]

介绍

新增动画参考模块，帮助书写动画文件和 setTempAnimation

[gemini-code-assist]

Summary of Changes

Hello @HardyNLee, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在通过引入一个全新的动画参考文档来增强 WebGAL 的文档体系。该文档详细阐述了如何构建多段动画，包括变换效果对象、动画片段对象以及动画数组的结构，并对 duration 和 ease 等关键参数进行了说明。这一改进将极大地帮助用户理解和编写动画文件，尤其是在使用 setTempAnimation 命令时，从而提升用户体验和开发效率。

Highlights

• 新增动画参考文档: 引入了一个新的文档页面，详细解释了 WebGAL 中的动画机制和用法。
• 更新侧边栏配置: 在中文侧边栏中添加了新动画参考文档的链接，方便用户导航。
• 命令文档链接更新: setAnimation 和 setTempAnimation 命令的文档已更新，以引用新的动画参考文档，提供更全面的信息。

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[gemini-code-assist]

Code Review

本次 PR 新增了动画参考文档，并更新了相关页面的链接，内容清晰，有助于用户理解和使用多段动画功能。代码和文档的修改都符合预期。我只在新文档中发现了一个小问题，并提出了修改建议。

[gemini-code-assist]

这行注释 立绘对象初始坐标为 (-500,0) 具有误导性。在 changeFigure 命令中并未指定 transform，因此立绘的初始坐标应为默认的 (0,0)。动画的第一个片段 {"position":{"x":-500},"duration":0} 实际上是将立绘瞬移到 (-500,0) 位置，然后才开始后续动画。

为了确保文档的准确性，建议修改此注释以反映真实的初始状态。

Suggested change

	; 立绘对象初始坐标为 (-500,0)
	; 立绘对象初始坐标为 (0,0)