Refactor Undefined Class Usage in SubNavigation

[martyanovandrey]

Problem

The SubNavigation component in diplodoc-platform/components uses the .dc-root_wide-format class, which isn't defined in the current library. This can cause styling issues.

Solution

Move the styles for .dc-root_wide-format from the diplodoc-platform/components package to the diplodoc-platform/client package.

Tasks

1. Identify Usage: Find all occurrences of .dc-root_wide-format in SubNavigation.
2. Move Styling: Transfer these styles to the client package.
3. Update References: Modify any references in SubNavigation to use the relocated styles.
4. Testing: Ensure the component works and is styled correctly post-changes.

Goal

Ensure SubNavigation maintains functionality and appearance with appropriately defined styles.