Remove webhook endpoint to create tasks (breaking change)

app/Controller/Webhook.php

@@ -1,42 +0,0 @@
-<?php
-
-namespace Kanboard\Controller;
-
-/**
- * Webhook controller
- *
- * @package  controller
- * @author   Frederic Guillot
- */
-class Webhook extends BaseController
-{
-    /**
-     * Webhook to create a task
-     *
-     * @access public
-     */
-    public function task()
-    {
-        $this->checkWebhookToken();
-
-        $defaultProject = $this->project->getFirst();
-
-        $values = array(
-            'title' => $this->request->getStringParam('title'),
-            'description' => $this->request->getStringParam('description'),
-            'color_id' => $this->request->getStringParam('color_id'),
-            'project_id' => $this->request->getIntegerParam('project_id', $defaultProject['id']),
-            'owner_id' => $this->request->getIntegerParam('owner_id'),
-            'column_id' => $this->request->getIntegerParam('column_id'),
-            'category_id' => $this->request->getIntegerParam('category_id'),
-        );
-
-        list($valid, ) = $this->taskValidator->validateCreation($values);
-
-        if ($valid && $this->taskCreation->create($values)) {
-            return $this->response->text('OK');
-        }
-
-        return $this->response->text('FAILED');
-    }
-}