huge rework in order to take full advantage of ansible roles

ansible/roles/notification/files/notification/notification.service

@@ -0,0 +1,3 @@
+[D-BUS Service]
+Name=org.freedesktop.Notifications
+Exec=/usr/lib/notification-daemon-1.0/notification-daemon

ansible/roles/notification/tasks/main.yml

@@ -0,0 +1,11 @@
+---
+- name: Install Notification Daemon
+  become: true
+  pacman:
+    name: notification-daemon
+    state: present
+- name: Setup Notification Daemon
+  become: true
+  synchronize:
+    src: notification/notification.service
+    dest: /usr/share/dbus-1/services/org.freedesktop.Notification.service