SUMMARY: add 4 new articles to nav (nginx/apache bad-request, SSH hardening, Watchtower relay)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SUMMARY.md

@@ -21,6 +21,7 @@ updated: 2026-04-13T10:16
     * [Docker vs VMs for the Homelab](02-selfhosting/docker/docker-vs-vms-homelab.md)
     * [Debugging Broken Docker Containers](02-selfhosting/docker/debugging-broken-docker-containers.md)
     * [Docker Healthchecks](02-selfhosting/docker/docker-healthchecks.md)
+    * [Watchtower SMTP via Localhost Postfix Relay](02-selfhosting/docker/watchtower-smtp-localhost-relay.md)
     * [Setting Up Caddy as a Reverse Proxy](02-selfhosting/reverse-proxy/setting-up-caddy-reverse-proxy.md)
     * [Tailscale for Homelab Remote Access](02-selfhosting/dns-networking/tailscale-homelab-remote-access.md)
     * [Network Overview](02-selfhosting/dns-networking/network-overview.md)
@@ -39,6 +40,9 @@ updated: 2026-04-13T10:16
     * [Fail2ban Custom Jail: WordPress Login Brute Force](02-selfhosting/security/fail2ban-wordpress-login-jail.md)
     * [SELinux: Fixing Fail2ban grep execmem Denial](02-selfhosting/security/selinux-fail2ban-execmem-fix.md)
     * [UFW Firewall Management](02-selfhosting/security/ufw-firewall-management.md)
+    * [Fail2ban: Enable the nginx-bad-request Jail](02-selfhosting/security/fail2ban-nginx-bad-request-jail.md)
+    * [Fail2ban Custom Jail: Apache Bad Request Detection](02-selfhosting/security/fail2ban-apache-bad-request-jail.md)
+    * [SSH Hardening Fleet-Wide with Ansible](02-selfhosting/security/ssh-hardening-ansible-fleet.md)
 * [Open Source & Alternatives](03-opensource/index.md)
     * [SearXNG: Private Self-Hosted Search](03-opensource/alternatives/searxng.md)
     * [FreshRSS: Self-Hosted RSS Reader](03-opensource/alternatives/freshrss.md)