refactor: update Nginx configuration and Docker setup

- Change user directive in Nginx configuration from 'nginx' to 'www-data'.
- Update upstream server configurations in Nginx to use 'localhost' instead of service names.
- Modify Nginx server block to redirect HTTP to a status page instead of Grafana.
- Rename Alertmanager location from '/alertmanager/' to '/alerts/' for consistency.
- Remove deprecated status page configuration and related files.
- Adjust Prometheus configuration to reflect the new Docker network settings.

infra/prometheus/prometheus.yml

@@ -13,7 +13,7 @@ scrape_configs:
   # Job для мониторинга Node Exporter
   - job_name: 'node'
     static_configs:
-      - targets: ['172.17.0.1:9100']  # Специальное имя для доступа к хосту
+      - targets: ['172.20.0.1:9100']  # IP хоста в Docker сети bots_network
         labels:
           instance: 'main-server'