修改katax版本以支持斜体字母进而美化公式

docs/index.html

@@ -32,7 +32,7 @@
   <!-- or <script src="//cdn.jsdelivr.net/gh/upupming/docsify-katex/dist/docsify-katex.js"></script> -->
   <link
     rel="stylesheet"
-    href="//cdn.jsdelivr.net/npm/katex@latest/dist/katex.min.css"
+    href="//cdn.jsdelivr.net/npm/katex@0.10.2/dist/katex.min.css"
   />
   <!-- Put them above docsify.min.js -->
   <script src="//cdn.jsdelivr.net/npm/docsify@latest/lib/docsify.min.js"></script>