Rearrange plugins documentation

docs/plugins/development/models.md

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+# Database Models
+
+## Creating Models
+
+If your plugin introduces a new type of object in NetBox, you'll probably want to create a [Django model](https://docs.djangoproject.com/en/stable/topics/db/models/) for it. A model is essentially a Python representation of a database table, with attributes that represent individual columns. Model instances can be created, manipulated, and deleted using [queries](https://docs.djangoproject.com/en/stable/topics/db/queries/). Models must be defined within a file named `models.py`.
+
+Below is an example `models.py` file containing a model with two character fields:
+
+```python
+from django.db import models
+
+class Animal(models.Model):
+    name = models.CharField(max_length=50)
+    sound = models.CharField(max_length=50)
+
+    def __str__(self):
+        return self.name
+```
+
+### Migrations
+
+Once you have defined the model(s) for your plugin, you'll need to create the database schema migrations. A migration file is essentially a set of instructions for manipulating the PostgreSQL database to support your new model, or to alter existing models. Creating migrations can usually be done automatically using Django's `makemigrations` management command.
+
+!!! note
+    A plugin must be installed before it can be used with Django management commands. If you skipped this step above, run `python setup.py develop` from the plugin's root directory.
+
+```no-highlight
+$ ./manage.py makemigrations netbox_animal_sounds 
+Migrations for 'netbox_animal_sounds':
+  /home/jstretch/animal_sounds/netbox_animal_sounds/migrations/0001_initial.py
+    - Create model Animal
+```
+
+Next, we can apply the migration to the database with the `migrate` command:
+
+```no-highlight
+$ ./manage.py migrate netbox_animal_sounds
+Operations to perform:
+  Apply all migrations: netbox_animal_sounds
+Running migrations:
+  Applying netbox_animal_sounds.0001_initial... OK
+```
+
+For more background on schema migrations, see the [Django documentation](https://docs.djangoproject.com/en/stable/topics/migrations/).
+
+## Enabling NetBox Features
+
+Plugin models can leverage certain NetBox features by inheriting from NetBox's `BaseModel` class. This class extends the plugin model to enable numerous feature, including:
+
+* Custom fields
+* Custom links
+* Custom validation
+* Export templates
+* Journaling
+* Tags
+* Webhooks
+
+This class performs two crucial functions:
+
+1. Apply any fields, methods, or attributes necessary to the operation of these features
+2. Register the model with NetBox as utilizing these feature
+
+Simply subclass BaseModel when defining a model in your plugin:
+
+```python
+# models.py
+from netbox.models import BaseModel
+
+class MyModel(BaseModel):
+    foo = models.CharField()
+    ...
+```
+
+### Enabling Features Individually
+
+If you prefer instead to enable only a subset of these features for a plugin model, NetBox provides a discrete "mix-in" class for each feature. You can subclass each of these individually when defining your model. (You will also need to inherit from Django's built-in `Model` class.)
+
+```python
+# models.py
+from django.db.models import models
+from netbox.models.features import ExportTemplatesMixin, TagsMixin
+
+class MyModel(ExportTemplatesMixin, TagsMixin, models.Model):
+    foo = models.CharField()
+    ...
+```
+
+The example above will enable export templates and tags, but no other NetBox features. A complete list of available feature mixins is included below. (Inheriting all the available mixins is essentially the same as subclassing `BaseModel`.)
+
+## Feature Mixins Reference
+
+!!! note
+    Please note that only the classes which appear in this documentation are currently supported. Although other classes may be present within the `features` module, they are not yet supported for use by plugins.
+
+::: netbox.models.features.CustomLinksMixin
+
+::: netbox.models.features.CustomFieldsMixin
+
+::: netbox.models.features.CustomValidationMixin
+
+::: netbox.models.features.ExportTemplatesMixin
+
+::: netbox.models.features.JournalingMixin
+
+::: netbox.models.features.TagsMixin
+
+::: netbox.models.features.WebhooksMixin