新版 mermaid 不需要css文件，移除不存在的css引用

views/blog/index.tpl

@@ -15,7 +15,6 @@
     <link href="{{cdncss "/static/bootstrap/css/bootstrap.min.css"}}" rel="stylesheet">
 
     <link href="{{cdncss "/static/font-awesome/css/font-awesome.min.css"}}" rel="stylesheet">
-    <link href="{{cdncss "/static/editor.md/lib/mermaid/mermaid.css"}}" rel="stylesheet">
     <link href="{{cdncss "/static/editor.md/lib/sequence/sequence-diagram-min.css"}}" rel="stylesheet">
     <link href="{{cdncss "/static/css/kancloud.css" "version"}}" rel="stylesheet">
     <link href="{{cdncss "/static/editor.md/css/editormd.preview.css"}}" rel="stylesheet">

views/document/default_read.tpl

@@ -21,7 +21,6 @@
     <link href="{{cdncss "/static/nprogress/nprogress.css"}}" rel="stylesheet">
     <link href="{{cdncss "/static/css/kancloud.css" "version"}}" rel="stylesheet">
     <link href="{{cdncss "/static/css/jstree.css"}}" rel="stylesheet">
-    <link href="{{cdncss "/static/editor.md/lib/mermaid/mermaid.css" "version"}}" rel="stylesheet">
     <link href="{{cdncss "/static/editor.md/lib/sequence/sequence-diagram-min.css" "version"}}" rel="stylesheet">
     <link href="{{cdncss "/static/editor.md/css/editormd.preview.css" "version"}}" rel="stylesheet">
     <link href="{{cdncss "/static/css/markdown.preview.css" "version"}}" rel="stylesheet">