Merge pull request #153 from stakater/add-missing-overviews

add missing overviews for

content/managed-addons/external-secrets-operator/overview.md

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 # Overview
+
+[External Secrets Operator](https://github.com/external-secrets/external-secrets-operator) is a powerful Kubernetes tool designed to simplify the management of external secrets and credentials within your cluster. With this operator, you can seamlessly integrate secrets stored in external vaults, key management services, or other secure storage solutions into your Kubernetes applications. It streamlines the process of fetching, managing, and securely distributing secrets to your pods, enhancing security and reducing complexity in secret management. Whether you need to access API tokens, database passwords, or other external secrets, the External Secrets Operator provides a seamless and efficient solution for your Kubernetes deployments.

content/managed-addons/vault/overview.md

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 # Overview
+
+[Vault](https://www.hashicorp.com/products/vault) is a comprehensive secrets management solution that securely stores, manages, and controls access to sensitive data and credentials. It offers a centralized platform for storing and safeguarding secrets, encryption keys, and other critical information. Vault's capabilities extend to dynamic secrets generation, data encryption, access control policies, and integration with various authentication methods. Whether you're dealing with API keys, database credentials, or other sensitive data, Vault provides a robust solution for maintaining security and compliance across your organization.

content/managed-addons/velero/overview.md

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 # Overview
+
+[Velero](https://velero.io/) is a powerful backup and restore tool tailored for Kubernetes environments. It simplifies the critical task of data protection, ensuring the safety and resilience of your Kubernetes workloads. Velero allows you to take snapshots of your cluster's resources, including persistent volumes, configurations, and metadata. These backups can then be stored securely, either on-premises or in the cloud, providing disaster recovery capabilities for your Kubernetes applications.
+
+Velero's versatility extends to:
+
+- **Migration:** Seamlessly move workloads across clusters and environments.
+- **Upgrades:** Safeguard your data during Kubernetes version upgrades.
+- **Retention Policies:** Define how long backups are retained to meet compliance requirements.
+- **Plugin Support:** Integrate with various cloud providers and storage backends.
+
+With Velero, you gain peace of mind knowing that your critical Kubernetes data is protected, recoverable, and resilient to unexpected events. It's an essential tool for ensuring the availability and reliability of your containerized applications.