feat: update Enterprise documentation with additional features and images

- Expanded the description of Enterprise features to include Application Authentication and Unlimited Concurrent Builds, enhancing clarity and detail.
- Added links to specific documentation sections for SSO, Custom Roles, Audit Logs, Whitelabeling, and the new features, improving navigation and user experience.
- Updated images related to the Enterprise features to ensure visual consistency and support the new content.

apps/docs/content/docs/core/enterprise/index.mdx

@@ -1,6 +1,6 @@
 ---
 title: Introduction
-description: Enterprise features for SSO, whitelabeling, and audit logs
+description: Enterprise features for SSO, application authentication, custom roles, audit logs, whitelabeling, and unlimited concurrent builds
 ---
 
 
@@ -15,10 +15,12 @@ Both include SSO, custom roles, audit logs, and Application Authentication. See
 
 ## What's included
 
-- **Single Sign-On (SSO)** — Integrate with Auth0, Keycloak, or other OIDC/SAML providers.
-- **Whitelabeling** — Rebrand the UI with your logo, colors, and domain (self-hosted only).
+- **Single Sign-On (SSO)** — Integrate with Auth0, Keycloak, or other OIDC/SAML providers. [Read more →](/docs/core/enterprise/sso)
+- **Application Authentication (Forward Auth)** — Put an SSO login gate in front of your deployed applications, powered by oauth2-proxy and Traefik. [Read more →](/docs/core/enterprise/sso/application-authentication)
 - **Custom Roles** — Create custom roles with granular permissions beyond the default Owner, Admin, and Member roles. [Read more →](/docs/core/enterprise/custom-roles)
 - **Audit Logs** — Track every action performed by members in your organization for security and compliance. [Read more →](/docs/core/enterprise/audit-logs)
+- **Whitelabeling** — Rebrand the UI with your logo, colors, and domain (self-hosted only). [Read more →](/docs/core/enterprise/whitelabeling)
+- **Unlimited Concurrent Builds** — Remove the OSS limit of 2 concurrent builds per server and set any concurrency you need (self-hosted only). [Read more →](/docs/core/concurrent-builds)
 - **All upcoming Enterprise features** — every new Enterprise feature we ship is automatically included in your license or plan, at no extra cost.
 
 More Enterprise features are on the way. [Contact us](https://dokploy.com/contact) if you want early access or have specific requirements.