Remove CTA image, bump up headings

Signed-off-by: Dj Walker-Morgan <[email protected]>

Author: djw-m

advocacy_docs/security/index.mdx

@@ -5,24 +5,29 @@ directoryDefaults:
   iconName: Security
   indexCards: full
   hideKBLink: true
+deepToC: true
 navigation:
+- '#Guides'
 - securing-postgresql
 - securing-epas
 - securing-pgd
+- '#Resources'
 - notifications
 ---
 
 This is the EDB Security Hub. It's a collection of resources to help you secure your PostgreSQL and EDB Postgres Databases, with everything from practical guides on how to secure your database, to the latest security updates and patches. 
 
 import TrustCenterLogo from './images/trust-center.png'
 
-<CTA image={TrustCenterLogo} actions={{url: "https://trust.enterprisedb.com", text: "Go to the Trust Center"}}>
+<CTA actions={{url: "https://trust.enterprisedb.com", text: "Go to the Trust Center"}}>
 
 If you are looking for a higher-level overview of EDB's security posture, practices and commitments, you may want to check out the EDB Trust Center
 
 </CTA>
 
-If you are looking for a higher-level overview of EDB's security posture, practices and commitments, you may want to check out the **[EDB Trust Center](https://trust.enterprisedb.com)**.
+## What's in the Security Hub?
+
+### Guides
 
 **[Securing PostgreSQL](securing-postgresql)** - This section provides a comprehensive guide on how to secure your PostgreSQL database. It covers everything from the basics of authentication and authorization, to more advanced topics such as encryption and auditing.
 * [PostgreSQL Security 101]() - The essentials of PostgreSQL security for those new to securing their database.
@@ -33,4 +38,9 @@ If you are looking for a higher-level overview of EDB's security posture, practi
 
 **[Securing EDB Postgres Distributed](securing-pgd)** - This section provides a comprehensive guide on how to secure your EDB Postgres Distributed and the needs of a distributed database. Building on the Postgres and EPAS security guides, this section covers the unique security considerations for distributed databases.
 
-**[Notifications](notifications)** - This is where you'll find reported security vulnerabilities and details on how to address them. This includes flaws which have been fixed in the PostgreSQL community and assessments on how they impact EDB users, as well as any advisories and fixes released by EDB.
+### Resources
+
+**[Notifications](notifications)** - This is where you'll find reported security vulnerabilities and details on how to address them. This includes flaws which have been fixed in the PostgreSQL community and assessments on how they impact EDB users, as well as any advisories and fixes released by EDB.
+
+---
+