Rearrange plugins documentation

docs/plugins/development/background-tasks.md

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+# Background Tasks
+
+By default, Netbox provides 3 differents [RQ](https://python-rq.org/) queues to run background jobs : *high*, *default* and *low*.
+These 3 core queues can be used out-of-the-box by plugins to define background tasks.
+
+Plugins can also define dedicated queues. These queues can be configured under the PluginConfig class `queues` attribute. An example configuration
+is below:
+
+```python
+class MyPluginConfig(PluginConfig):
+    name = 'myplugin'
+    ...
+    queues = [
+        'queue1',
+        'queue2',
+        'queue-whatever-the-name'
+    ]
+```
+
+The PluginConfig above creates 3 queues with the following names: *myplugin.queue1*, *myplugin.queue2*, *myplugin.queue-whatever-the-name*.
+As you can see, the queue's name is always preprended with the plugin's name, to avoid any name clashes between different plugins.
+
+In case you create dedicated queues for your plugin, it is strongly advised to also create a dedicated RQ worker instance. This instance should only listen to the queues defined in your plugin - to avoid impact between your background tasks and netbox internal tasks.
+
+```
+python manage.py rqworker myplugin.queue1 myplugin.queue2 myplugin.queue-whatever-the-name
+```