Rewrite about page using own route (Close #48).

src/Bundle/Resources/config/listeners.yml

@@ -113,3 +113,13 @@ services:
       - '@netzmacht.contao_leaflet.definition.builder'
     tags:
       - { name: 'contao.hook', hook: 'initializeSystem', method: 'onInitializeSystem' }
+
+  netzmacht.contao_leaflet.listeners.backend_menu:
+    class: Netzmacht\Contao\Leaflet\Listener\Backend\UserNavigationListener
+    arguments:
+      - '@request_stack'
+      - '@router'
+      - '@translator'
+      - '@netzmacht.contao_toolkit.assets_manager'
+    tags:
+      - { name: 'contao.hook', hook: 'getUserNavigation', method: '__invoke'}

src/Bundle/Resources/config/routing.yml

@@ -1,5 +1,5 @@
 leaflet_layer:
-  path: /layer/{layerId}
+  path: /leaflet/api/layer/{layerId}
   controller: Netzmacht\Contao\Leaflet\Frontend\Action\LayerDataAction
   defaults:
     _leaflet_scope: page
@@ -9,3 +9,10 @@ leaflet_layer:
     _format: geojson
     context: \w+
     contextId: \d+
+
+leaflet_backend_about:
+  path: /contao/leaflet/about
+  controller: Netzmacht\Contao\Leaflet\Backend\Action\AboutAction
+  defaults:
+    _scope: backend
+    _backend_module: leaflet_about

src/Bundle/Resources/config/services.yml

@@ -131,3 +131,8 @@ services:
     arguments:
       - '@netzmacht.contao_leaflet.map.provider'
       - '@netzmacht.contao_leaflet.filter_factory'
+
+  Netzmacht\Contao\Leaflet\Backend\Action\AboutAction:
+    arguments:
+      - '@templating'
+      - '%kernel.project_dir%'