Fix accessibility issues with breadcrumbs component

[certainlyakey]

What happened?

The breadcrumbs component lacks accessibility (and usability partially is also hurt) - href attribute is missing (see eg. here why this is an issue). The links in the breadcrumbs must have URLs provided.

As a part of this issue all necessary optimisations allowing for the best experience in a screen reader should be done (based on testing with screen reader software). Eg. nav or aria-label could help with the correct comprehension of the component in assistive devices as a "proper" breadcrumbs widget.

Reproduction steps

1. Go to https://e-gov.github.io/cvi/?path=/story/angular-breadcrumbs--default
2. Check the generated markup
3. Expected: links have hrefs
4. Observed: hrefs are absent

Screenshot

No response

Package

Angular

Version

1.8.0

Reproduction URL

https://e-gov.github.io/cvi/?path=/story/angular-breadcrumbs--default

Browser

No response

Browser version

No response

Extra details about your environment

No response

Relevant log output

No response

[certainlyakey]

@ekateriinal is working on it.