Delete mermaid.css

Author: lucic71

docs/book.toml

@@ -11,7 +11,6 @@ create-missing = false
 git-repository-url = "https://github.com/cpp2rust/cpp2rust"
 edit-url-template = "https://github.com/cpp2rust/cpp2rust/edit/master/docs/{path}"
 additional-js = ["mermaid.min.js", "mermaid-init.js"]
-additional-css = ["mermaid.css"]
 
 [output.html.fold]
 enable = true

docs/mermaid.css

@@ -1,5 +1,7 @@
 # The Translation Pipeline
 
+<style>pre.mermaid { text-align: center; }</style>
+
 ```mermaid
 flowchart TD
     driver["<b>cpp2rust</b><br/><code>cpp2rust/cpp2rust.cpp</code>"]