dhi: add aliases (#23935)

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## Description

`about` was renamed `explore`. Added some aliases.

## Related issues or tickets

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## Reviews

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- [ ] Editorial review

Signed-off-by: Craig Osterhout <craig.osterhout@docker.com>

content/manuals/dhi/explore/_index.md

@@ -29,6 +29,8 @@ params:
       icon: question_exchange
       description: Docker welcomes all contributions and feedback.
       link: /dhi/explore/feedback
+aliases:
+  - /dhi/about/
 ---
 
 Docker Hardened Images (DHI) are minimal, secure, and production-ready container

content/manuals/dhi/explore/available.md

@@ -4,6 +4,8 @@ title: Available types of Docker Hardened Images
 description: Learn about the different image types, distributions, and variants offered in the Docker Hardened Images catalog.
 keywords: docker hardened images, distroless containers, distroless images, docker distroless, alpine base image, debian base image, development containers, runtime containers, secure base image, multi-stage builds
 weight: 20
+aliases:
+  - /dhi/about/available/
 ---
 
 Docker Hardened Images (DHI) is a comprehensive catalog of

content/manuals/dhi/explore/build-process.md

@@ -4,6 +4,8 @@ linkTitle: Build process
 description: Learn how Docker builds, tests, and maintains Docker Hardened Images through an automated, security-focused pipeline.
 keywords: docker hardened images, slsa build level 3, automated patching, ai guardrail, build process, signed sbom, supply chain security
 weight: 15
+aliases:
+  - /dhi/about/build-process/
 ---
 
 Docker Hardened Images are built through an automated pipeline that monitors

content/manuals/dhi/explore/feedback.md

@@ -4,6 +4,8 @@ linkTitle: Feedback
 description: How to interact with the DHI team
 keywords: software supply chain security, feedback, bugs, discussion, questions
 weight: 50
+aliases:
+  - /dhi/about/feedback/
 ---
 
 Committed to maintaining the quality, security, and reliability of the Docker Hardened Images (DHI)

content/manuals/dhi/explore/responsibility.md

@@ -4,6 +4,8 @@ linkTitle: Responsibility overview
 description: Understand the division of responsibilities between Docker, upstream projects, and you when using Docker Hardened Images.
 keywords: software supply chain security, signed sbom, vex document, container provenance, image attestation
 weight: 46
+aliases:
+  - /dhi/about/responsibility/
 ---
 
 Docker Hardened Images (DHIs) are curated and maintained by Docker, and built

content/manuals/dhi/explore/test.md

@@ -4,6 +4,8 @@ linktitle: Image testing
 description: See how Docker Hardened Images are automatically tested for standards compliance, functionality, and security.
 keywords: docker scout, test attestation, cosign verify, image testing, vulnerability scan
 weight: 45
+aliases:
+  - /dhi/about/test/
 ---
 
 Docker Hardened Images (DHIs) are designed to be secure, minimal, and

content/manuals/dhi/explore/what.md

@@ -4,6 +4,8 @@ linktitle: Hardened images
 description: Learn what a hardened image is, why it matters, and how Docker Hardened Images offer stronger security, compliance, and operational efficiency.
 keywords: hardened container image, docker hardened images, distroless container, slsa build level 3, signed sbom, vulnerability scan, compliance-ready container
 weight: 5
+aliases:
+  - /dhi/about/what/
 ---
 
 In today’s diverse software environments, container images are often designed