Remove reliance on django-markdownx (#3231)

* Remove reliance on django-markdownx

- We are now rendering notes on the client side using easymde
- No longer any need to utilize the markdownx integration
- Adds character limit for notes fields`

* Adjust legacy migrations - remove references to markdownx

* Fix bug for company notes field

InvenTree/company/migrations/0010_auto_20200201_1231.py

@@ -1,7 +1,6 @@
 # Generated by Django 2.2.9 on 2020-02-01 12:31
 
-from django.db import migrations
-import markdownx.models
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
@@ -14,6 +13,6 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='company',
             name='notes',
-            field=markdownx.models.MarkdownxField(blank=True),
+            field=models.TextField(blank=True),
         ),
     ]

InvenTree/company/migrations/0032_auto_20210403_1837.py

@@ -5,7 +5,6 @@ import company.models
 import django.core.validators
 from django.db import migrations, models
 import django.db.models.deletion
-import markdownx.models
 import stdimage.models
 
 
@@ -44,7 +43,7 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='company',
             name='notes',
-            field=markdownx.models.MarkdownxField(blank=True, verbose_name='Notes'),
+            field=models.TextField(blank=True, verbose_name='Notes'),
         ),
         migrations.AlterField(
             model_name='supplierpart',

InvenTree/company/migrations/0045_alter_company_notes.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.13 on 2022-06-20 11:23
+
+import InvenTree.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('company', '0044_auto_20220607_2204'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='company',
+            name='notes',
+            field=InvenTree.fields.InvenTreeNotesField(blank=True, help_text='Company Notes', max_length=50000, null=True, verbose_name='Notes'),
+        ),
+    ]