Add sub category for storage

[AlexAndBear]

No description provided.

[Copilot]

Copilot reviewed 4 out of 6 changed files in this pull request and generated no comments.

Files not reviewed (2)

• docs/admin/20-getting-started/30-other/category.json: Language not supported
• docs/admin/30-configuration/80-storage/category.json: Language not supported

Comments suppressed due to low confidence (5)

docs/admin/30-configuration/80-storage/20-cephfs.md:4

• The title 'CephsFS' appears to have a typo; consider renaming it to 'CephFS' for consistency with standard terminology.

title: "CephsFS"

docs/admin/30-configuration/80-storage/30-decomposeds3.md:4

• [nitpick] The removal of the 'Storage:' prefix in the title may affect consistency across storage documentation. Please confirm that this naming style is intentional.

title: "Decomposeds3"

docs/admin/30-configuration/80-storage/30-decomposeds3.md:68

• The updated relative path for the login page image may be incorrect if the image location hasn't been adjusted accordingly; please verify that the image loads as expected.

<img src={require("./../img/login-page.png").default} alt="Admin general" width="1920"/>

docs/admin/30-configuration/80-storage/30-decomposeds3.md:70

• The updated relative path for the 'decomposeds3-with-minio' image should be checked to ensure it correctly points to the intended image location.

<img src={require("./../img/decomposeds3-with-minio.png").default} alt="Admin general" width="1920"/>

docs/admin/30-configuration/80-storage/30-decomposeds3.md:78

• The revised relative link for the Common Issues page should be verified to ensure it resolves correctly in the updated documentation structure.

- [Common Issues & Help](../../50-resources/30-common-issues.md)

[Svanvith]

LGTM