refactor: update repo and install packages in one step

tasks/install-packages.yml

 ---
-# Äquivalent von apt-get update
-- name: apt-get update
-  apt:
-    update_cache: "yes"
-
 - name: Install/Update Debian packages
   apt:
+    update_cache: "yes"
     state: present
     name: [
       'lynx',