remove duplicate include of mermaid.js

Author: dirkolbrich

_includes/markdown-enhancements/mermaid.html

@@ -1,8 +1,11 @@
+{% if page.mermaid == true %}
 <script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/8.0.0/mermaid.min.js"></script>
 <script>
-   mermaid.initialize({
-       startOnLoad:true,
-       theme: 'default'
-   });
-   window.mermaid.init(undefined, document.querySelectorAll('.language-mermaid'));
+var config = {
+    startOnLoad:true,
+    theme: 'default'
+};
+mermaid.initialize(config);
+window.mermaid.init(undefined, document.querySelectorAll('.language-mermaid'));
 </script>
+{% endif %}

_layouts/mermaid.html

@@ -7,8 +7,6 @@ mermaid: true
 
 A picture of the most commonly encountered branches of the tree.
 
-{{page.mermaid}}
-
 The full FreeCAD source tree has many other branches, but most Contributors will
 only need to deal with these: