Removed undeed task file, remove set variables

tasks/install-requirements.yml

----
-
-- name: Install HedgeDoc dependencies
-  apt:
-    name: ['postgresql','nodejs','git','npm','yarn','bash','nginx','python3-psycopg2','libpq-dev']
-    state: present
-    update_cache: yes

vars/main.yml

 ---
-# vars file for hedgedocs-pad-lqdn_
-
-hedgedoc_version: "1.9.0"
-hedgedoc_sql_password: "{{ vault_service_hedgedocs_sql_password }}"
-hedgedoc_session_secret: "{{ vault_hedgedoc_session_secret }}"
-hedgedocs_domain: "{{ service_hedgedocs_domain }}"
-hedgedoc_db_name: hedgedocs-user
-hedgedoc_db_user: hedgedocs
+# vars file for hedgedocs-pad-lqdn_
\ No newline at end of file