Improve accessibility of news article tags

[StephDriver]

The problem

News Articles are filtered by tags.

The tags have visual styling that indicates their function, but are programmatically simply links and so do not indicate their function to assistive technologies.

<a class="bg-tan border-white border-2 rounded-full py-2 px-4" 
          href="/news/all/tag/Announcement/">
          Announcement (330)
        </a>

Tasks

• [ ] use aria-label to describe the purpose of the link
• [ ] counts of articles on tags should have aria labels that give the number context e.g. "217 articles" rather than just "217".

Additional Information

see https://www.w3.org/WAI/WCAG22/Techniques/aria/ARIA8.html