Examples: editor.html

the editor.html examples contain outdated css links
```html
<link rel="stylesheet" href="static/css/editor/dialog.css" /> 
<link rel="stylesheet" href="static/css/editor/linkdialog.css" /> 
<link rel="stylesheet" href="static/css/editortoolbar.css" />  
```
and also a duplicated dialog.css after fixing the outdate links
```html
<link rel="stylesheet" href="static/css/dialog.css" />
```