Remove Mermaid support from mdbook build configuration

book.toml

@@ -7,10 +7,7 @@ description = "A taxonomy of puzzle design patterns from classic point-and-click
 [output.html]
 git-repository-url = "https://github.com/noti/puzzle-design-kb"
 edit-url-template = "https://github.com/noti/puzzle-design-kb/edit/main/{path}"
-additional-js = ["mermaid.min.js", "mermaid-init.js"]
 
 [output.html.playground]
 editable = true
 line-numbers = true
-
-[preprocessor.mermaid]