Extract developer site (#5249)

* Extract developer site

* Fix title in sidebar

* Update dev section reference

* Update edit in github link on help page

source/developers/intent/handling.markdown

@@ -9,41 +9,6 @@ sharing: true
 footer: true
 ---
 
-Any component can register to handle intents. This allows a single component to handle intents fired from multiple voice assistants.
-
-A component has to register an intent handler for each type that it wants to handle. Intent handlers have to extend `homeassistant.helpers.intent.IntentHandler`
-
-```python
-import asyncio
-from homeassistant.helpers import intent
-
-DATA_KEY = 'example_key'
-
-@asyncio.coroutine
-def async_setup(hass, config):
-    hass.data[DATA_KEY] = 0
-    intent.async_register(hass, CountInvocationIntent())
-
-
-class CountInvocationIntent(intent.IntentHandler):
-    """Handle CountInvocationIntent intents."""
-
-    # Type of intent to handle
-    intent_type = 'CountInvocationIntent'
-
-    # Optional. A validation schema for slots
-    # slot_schema = {
-    #     'item': cv.string
-    # }
-
-    @asyncio.coroutine
-    def async_handle(self, intent_obj):
-        """Handle the intent."""
-        intent_obj.hass.data[DATA_KEY] += 1
-
-        response = intent_obj.create_response()
-        response.async_set_speech(
-            "This intent has been invoked {} times".format(
-                intent_obj.hass.data[DATA_KEY]))
-        return response
-```
+<script>
+window.location = 'https://developers.home-assistant.io/docs/en/intent_handling.html';
+</script>