docs: 添加博客文档并更新旧版手册链接

- 在文档目录中添加博客索引页面
- 修正旧版手册链接的尾部斜杠

Author: xinetzone

doc/_static/switcher.json

@@ -12,6 +12,6 @@
   {
     "name": "torch-book 旧版",
     "version": "old",
-    "url": "https://torch-book.readthedocs.io/zh-cn/old"
+    "url": "https://torch-book.readthedocs.io/zh-cn/old/"
   }
 ]

doc/blog/index.md

@@ -0,0 +1,13 @@
+# 博客
+
+```{button-link} ./archive.html
+:color: primary
+阅读博文
+```
+
+```{postlist}
+:list-style: circle
+:date: "%Y-%m-%d"
+:format: "{title} - {date}"
+:excerpts:
+```

doc/index.md

@@ -2,6 +2,7 @@
 
 ```{toctree}
 readme
+blog/index
 旧版 Torch 手册 <https://torch-book.readthedocs.io/zh-cn/old/index.html>
 ```