✨ feat: add admonition functionality and markdown-extended-features article, improve blockquote styling

src/content/posts/guides/Markdown Extended Features-zh.md

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+---
+title: Markdown 扩展功能
+published: 2025-04-25
+tags:
+  - 指南
+toc: false
+lang: zh
+abbrlink: markdown-extended-features
+---
+
+以下是 Retypeset 主题的 Markdown 扩展功能，包括语法示例与样式效果。
+
+## 提示块
+
+使用容器指令 `:::type` 或 GitHub 语法 `> [!TYPE]`，即可创建提示块。支持以下五种类型：`note`、`tip`、`important`、`warning` 和 `caution`。
+
+### 语法
+
+```
+:::note
+Useful information that users should know, even when skimming content.
+:::
+
+> [!NOTE]
+> Useful information that users should know, even when skimming content.
+
+:::note{title="YOUR CUSTOM TITLE"}
+This is a note with a custom title.
+:::
+```
+
+### 效果
+
+> [!NOTE]
+> Useful information that users should know, even when skimming content.
+
+> [!TIP]
+> Helpful advice for doing things better or more easily.
+
+> [!IMPORTANT]
+> Key information users need to know to achieve their goal.
+
+:::warning
+Urgent info that needs immediate user attention to avoid problems.
+:::
+
+:::caution
+Advises about risks or negative outcomes of certain actions.
+:::
+
+:::note{title="YOUR CUSTOM TITLE"}
+This is a note with a custom title.
+:::
+
+## 图注
+
+使用 Markdown 图像语法 `![alt](src)`，**且上下均为空行**，即可自动生成图注。在 `alt` 前添加下划线 `_` 或留空 alt，即可隐藏图注。
+
+### 显示图注
+
+```
+
+![图片描述](./full/or/relative/path/of/image)
+
+```
+
+### 隐藏图注
+
+```
+![_图片描述](./full/or/relative/path/of/image)
+
+![](./full/or/relative/path/of/image)
+```