fix: set use_directory_urls=false to fix relative image paths

Author: codingriver

mkdocs.yml

@@ -3,6 +3,7 @@ site_description: 从 Hugo 迁移到 MkDocs 的知识库
 site_url: https://codingriver.github.io/
 repo_url: https://github.com/codingriver/codingriver.github.io
 edit_uri: edit/master/docs/
+use_directory_urls: false
 theme:
   name: material
   language: zh