Add filter tag anchor markup example

[anselmbradford]

Filter tags may be buttons or anchor (link) elements. See https://www.consumerfinance.gov/data-research/prepaid-accounts/search-agreements/ for an anchor element.

Additions

• Add filter tag link example

Testing

1. Visit https://deploy-preview-2120--cfpb-design-system.netlify.app/design-system/components/tags#filter-tag and see that there's a filter tag that uses anchor markup, and that it is the same height as the button filter tags.

Screenshot

[netlify]

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