Is your feature request related to a problem?

The "Global menu" content block was previously used to define the navigation structure of the platform for desktop. However, with the new unified navigation system based on a hamburger menu (now used across both desktop and mobile), this content block has become obsolete. Maintaining it adds unnecessary complexity and may confuse administrators who believe it is still used to configure navigation.

Describe the solution you'd like

Remove the "Global menu" content block from the admin panel and all related logic from the codebase.

This includes:

• Removing the block from the list of available content blocks.
• Ensuring the block cannot be added or edited in existing configurations.
• Removing any frontend or backend logic related to rendering this block.

Additional context

This change is part of the broader header and navigation refactor aimed at simplifying the user experience and unifying the navigation system across devices.

Does this issue impact users' private data?

No, it does not involve processing personal data.

Acceptance Criteria

• The "Global menu" content block is no longer available in the list of content blocks.
• Any instances of the "Global menu" block are automatically removed or ignored by the frontend.
• The new hamburger menu functions independently of the removed block on all screen sizes.