Add a markdown editor for the 'Notes" field of Part model

https://github.com/timmyomahony/django-pagedown

InvenTree/part/admin.py

@@ -8,6 +8,8 @@ from import_export.resources import ModelResource
 from import_export.fields import Field
 import import_export.widgets as widgets
 
+from .forms import PartAdminForm
+
 from .models import PartCategory, Part
 from .models import PartAttachment, PartStar
 from .models import BomItem
@@ -70,6 +72,9 @@ class PartResource(ModelResource):
 
 class PartAdmin(ImportExportModelAdmin):
 
+    form = PartAdminForm
+    #fields = "__all__"
+    
     resource_class = PartResource
 
     list_display = ('full_name', 'description', 'total_stock', 'category')