Revamp overview page

Author: jarrodwatts

docs/cdk/concepts/layer2s.md

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+# What is a Layer 2 Blockchain?

docs/cdk/overview.md

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 The CDK provides the components necessary to build a layer 2 blockchain that is secure, scalable, and interoperable with other chains. Below are some of the key features of the CDK:
 
-### **Scalability**: todo
+- **Security**: The Polygon Labs team are pioneers in the zero-knowledge ecosystem and have built many of the most advanced ZK technologies in production today such as [plonky3](https://docs.polygon.technology/learn/plonky/?h=plonky3#plonky-3). The CDK leverages allows developers to build high-performance, high-security, scalable L2s that utilize the latest innovations in zero-knowledge technology.
 
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+- **Scalability**: Transaction fees and finality on chains built with the CDK are orders of magnitude lower and faster than Ethereum. By building a chain with the CDK, developers can provide users with a seamless experience that is fast, cheap, secure and unaffected by any extraneous high activity on shared networks.
 
-### **Sovereignity**: todo
+- **Modularity**: As logic is separated into modular components, developers can easily swap out components in a "plug and play" fashion to customize their chain, for example, by replacing entire components such as the data availability layer, or making granular-level configurations to each component; such as modifying the sequencer logic to comply with legal regulations.
 
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+- **Interoperability**: Chains built with the CDK can access the users and liquidity of all other chains that have opted into the [AggLayer](https://docs.polygon.technology/cdk/glossary/#agglayer-v1-al1). This enables cross-chain transactions and access to the users & liquidity of other chains out of the box without forcing users to manually bridge assets to your chain.
 
-### **Modularity**: todo
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-### **Interoperability**: todo
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-## Why Use the CDK?
-
-The CDK bootstraps the development process of creating a layer 2 blockchain. Developers can easily set up the stack and begin configuring each component’s behavior with a fast feedback loop on a local development environment.
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-As logic is separated into modular components, developers can easily swap out components in a "plug and play" fashion to customize their chain, for example, by replacing entire components such as the data availability layer, or making granular-level configurations to each component; such as modifying the sequencer logic to comply with legal regulations.
-
-### Tap Into the AggLayer
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-By default, CDK chains are opted into the Aggregation Layer (AggLayer) which enables cross-chain transactions among other L2 chains that are also opted into the AggLayer, including the [Polygon zkEVM](https://docs.polygon.technology/zkEVM/).
-
-This provides a powerful network effect by enabling users to interact with smart contracts on your chain without having to manually bridge assets to it. This is especially useful for developers looking to bootstrap their chain’s ecosystem and have immediate access to a large pool of users and liquidity.
-
-### Utilize Best-in-Class ZK Technology
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-The Polygon team are pioneers in the zero-knowledge ecosystem and has built many of the most advanced ZK technologies in production today such as plonky2 and plonky3.
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-The CDK leverages these technologies to provide a high-performance, scalable, and secure layer 2 blockchain that is battle-tested in production with the Polygon zkEVM.
+- **Sovereignty**: There is no sacrifice required when building a chain with the CDK or joining the AggLayer. Developers maintain full control over the chain’s revenue, governance, security, economic policies, etc.
 
 ## Dive Deeper into the CDK
 
 Whether you’re a developer looking to build a new chain or a researcher interested in looking under the hood, the CDK documentation provides a comprehensive guide to the CDK’s architecture, components, and how to get started building with the CDK:
 
-- concepts behind the CDK and how it works.
-- todo
-- todo
+- [Concepts](https://docs.polygon.technology/cdk/concepts/layer2s) to understand the CDK at a high level
+- [Getting Started](https://docs.polygon.technology/cdk/getting-started) to deploy a CDK stack on your local machine
+- [Architecture](https://docs.polygon.technology/cdk/architecture/cdk-zkevm/) to understand the CDK’s components and how they interact with each other

mkdocs.yml

@@ -53,7 +53,9 @@ nav:
   - CDK:
       - CDK: cdk/index.md
       - Overview: cdk/overview.md
-      - Get started: 'cdk/getting-started.md'
+      - Get started: cdk/getting-started.md
+      - Concepts:
+        - Layer 2s: cdk/concepts/layer2s.md
       - Architecture:
         - CDK rollup: cdk/architecture/cdk-zkevm.md
         - CDK validium: cdk/architecture/cdk-validium.md