title: How to disable browse server option for non admin while uploading image in django-ckeditor?
body: <p>I have a blog on django on which any public can post. In post content I am using django-ckeditor RichTextUploadingField. </p>
  
  <p>There is button Browse server for images in ckeditor, that let users browse images of server's upload directory and embed images in post. </p>
  
  <p>But i want to restrict public from browsing images on server when they make post. They should be able upload images only, not browse every image on server that is uploaded.</p>
  
  <p>Here is my models.py</p>
  
  <pre class="lang-py prettyprint-override"><code>
  class Article(models.Model):
      title = models.CharField(max_length = 200)
      content = RichTextUploadingField()
      author = models.ForeignKey(User, on_delete= models.CASCADE, null=True)
  
      def __str__(self):
          return self.title
  </code></pre>
  
  <p>Forms.py</p>
  
  <pre class="lang-py prettyprint-override"><code>
  class ArticleForm(ModelForm):
      class Meta:
          model = Article
          widgets = {
              'content': RichTextUploadingField()
          }
  
  </code></pre>