Breadcrumb functionality

[ggyczew]

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Description

Added minor changes that enabled Breadcrumb functionality.
There was issue with active_item property - it failed to create url for endpoint with parameter which was in children's collection but not active. Therefore _expected_args are not found in the args
After this changes I can use list_path to get list of items in the active path.
{%- for breadcrumb in current_menu.list_path(current_menu.root, current_menu.active_item.path) -%}

I have added additional example with Bootstrap 5 navbar.

I did somehow succeed to run pytest which fail on three of test concerning classy

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