Changes to make possible implement api endpoint

Update documentation
Start implementing getSystems route
Code to route getSystems
Controller to board import
Change return
Increase coverage

Signed-off-by: Vitor Mattos <vitor@php.rio>

tests/unit/Service/BoardServiceTest.php

@@ -73,8 +73,6 @@ class BoardServiceTest extends TestCase {
 	private $changeHelper;
 	/** @var IEventDispatcher */
 	private $eventDispatcher;
-	/** @var TrelloImportService */
-	private $trelloImportService;
 	private $userId = 'admin';
 
 	public function setUp(): void {
@@ -93,7 +91,6 @@ class BoardServiceTest extends TestCase {
 		$this->activityManager = $this->createMock(ActivityManager::class);
 		$this->changeHelper = $this->createMock(ChangeHelper::class);
 		$this->eventDispatcher = $this->createMock(IEventDispatcher::class);
-		$this->trelloImportService = $this->createMock(TrelloImportService::class);
 
 		$this->service = new BoardService(
 			$this->boardMapper,
@@ -110,7 +107,6 @@ class BoardServiceTest extends TestCase {
 			$this->activityManager,
 			$this->eventDispatcher,
 			$this->changeHelper,
-			$this->trelloImportService,
 			$this->userId
 		);