fix remaining yaml lint nitpicks

- add missing document start (---) to contact-points.yml and docker-compose files
- fix extra spaces inside braces in dotfiles and common role tasks

ansible/services/authelia/docker-compose.yml

@@ -1,3 +1,4 @@
+---
 # Authelia - SSO/authentication portal with LLDAP + MariaDB
 # Host: helsinki-a (100.67.6.27)
 # Data: /root/authelia/

ansible/services/bitwarden/docker-compose.yml

@@ -1,3 +1,4 @@
+---
 # Bitwarden - Self-hosted password manager
 # Host: helsinki-a (100.67.6.27)
 # Data: Docker volume (bitwarden)

ansible/services/forgejo/docker-compose.yml

@@ -1,3 +1,4 @@
+---
 # Forgejo - Self-hosted Git forge
 # Host: helsinki-a (100.67.6.27)
 # Data: /srv/forgejo/data

ansible/services/grafana/provisioning/alerting/contact-points.yml

@@ -1,3 +1,4 @@
+---
 apiVersion: 1
 
 # Contact points — defines where alerts are sent.