feat: integrate Uptime Kuma and Alertmanager into Docker setup

- Add Uptime Kuma service for status monitoring with health checks.
- Introduce Alertmanager service for alert management and notifications.
- Update docker-compose.yml to include new services and their configurations.
- Enhance Makefile with commands for managing Uptime Kuma and Alertmanager logs.
- Modify Ansible playbook to install necessary packages and configure SSL for new services.
- Update Nginx configuration to route traffic to Uptime Kuma and Alertmanager.
- Adjust Prometheus configuration to include alert rules and external URLs.

infra/nginx/conf.d/grafana.conf

@@ -1,9 +1,3 @@
-# Grafana reverse proxy configuration
-upstream grafana_backend {
-    server grafana:3000;
-    keepalive 32;
-}
-
 # Grafana proxy configuration
 location /grafana/ {
     proxy_pass http://grafana_backend/;