nginx endpoints addition - grafana documentation update

Fix monitoring stack configuration for HF Spaces: Add Alertmanager, Pushgateway, and fix Prometheus/Grafana connection

fix(docker): configure Grafana for hf.space domain to fix asset loading

fix(docker): switch Grafana to root serving with nginx path stripping

fix(nginx): do not strip path for Grafana (pass entire /grafana/ prefix)

fix(nginx): use standard proxy_pass for Grafana to fix 404s

fix(nginx): use direct IP for Prometheus proxy

fix(nginx): add redirects for missing trailing slashes

Merge branch 'main' into aggiornamento-doc

aggiornamento documentazione e refactor struttura repo per docker