[ZT] Add overview page for implementation guides (#19537)

* add overview page

* tweak wording

Author: ranbel

src/content/docs/cloudflare-one/implementation-guides/index.mdx

@@ -3,12 +3,30 @@ pcx_content_type: navigation
 title: Implementation guides
 sidebar:
   order: 3
-  group:
-    hideIndex: true
 head: []
 description: View implementation guides for Cloudflare Zero Trust.
 ---
 
-import { DirectoryListing } from "~/components";
+import { CardGrid, LinkTitleCard } from "~/components";
 
-<DirectoryListing />
+Implementation guides cover deployment steps and best practices for specific Cloudflare One use cases.
+
+<CardGrid>
+
+<LinkTitleCard title="Secure your Internet Traffic and SaaS apps" href="/learning-paths/secure-internet-traffic/" icon="seti:lock">
+	Provide your users and networks with a secure, performant, and flexible path to the Internet.
+</LinkTitleCard>
+
+<LinkTitleCard title="Replace your VPN" href="/learning-paths/secure-internet-traffic/" icon="seti:db">
+	Give users secure, auditable network and application access.
+</LinkTitleCard>
+
+<LinkTitleCard title="Deploy Zero Trust Web Access" href="/learning-paths/secure-internet-traffic/" icon="laptop">
+	Secure access to internal web applications without a device client.
+</LinkTitleCard>
+
+<LinkTitleCard title="Secure Microsoft 365 email with Email Security" href="/learning-paths/secure-o365-email/" icon="email">
+	Use Cloudflare's Email Security to protect your Microsoft 365 email inbox from phishing and malware attacks.
+</LinkTitleCard>
+
+</CardGrid>