Closes #11294: Markdown Preview (#11894)

* MarkdownWidget

* Change border and color of active markdown tab

* Fix template name typo

* Add render markdown endpoint

* Static assets for markdown widget

* widget style fix and unique ids based on name

* Replace SmallTextArea with SmallMarkdownWidget

* Clear innerHTML before swapping

* render markdown directly in template

* change render markdown view path

* remove small markdown widget

* Simplify rendering logic

* Use a form to clean input Markdown data

---------

Co-authored-by: Jeremy Stretch <jstretch@ns1.com>

netbox/utilities/forms/fields/fields.py

@@ -27,7 +27,7 @@ class CommentField(forms.CharField):
     """
     A textarea with support for Markdown rendering. Exists mostly just to add a standard `help_text`.
     """
-    widget = forms.Textarea
+    widget = widgets.MarkdownWidget
     help_text = f"""
         <i class="mdi mdi-information-outline"></i>
         <a href="{static('docs/reference/markdown/')}" target="_blank" tabindex="-1">