feat: add SEO descriptions to all pages and fix canonical URL

content/3.serveex/3.security/1.wireguard.md

@@ -1,6 +1,7 @@
 ---
 navigation: true
 title: Wireguard
+description: Install and configure WireGuard VPN to securely access your homelab from anywhere and connect all your devices to your private network.
 main:
   fluid: false
 ---

content/3.serveex/3.security/2.authentik.md

@@ -1,6 +1,7 @@
 ---
 navigation: true
 title: Authentik
+description: Install Authentik as a self-hosted identity provider — configure MFA and protect your services with SSO and reverse proxy authentication.
 main:
   fluid: false
 ---

content/3.serveex/3.security/3.cloudflare.md

@@ -1,6 +1,7 @@
 ---
 navigation: true
 title: Cloudflare Zero Trust
+description: Use Cloudflare Tunnels and Zero Trust to expose homelab services without opening ports — configure SWAG and manage multiple tunnels.
 main:
   fluid: false
 ---