Allow 'rel' attribute on `<a>` link with specific values (for hashtag recognition).

Merged Fong-Wan Chau requested to merge FongWan/pleroma:feature/allow-link-rel-attribute into develop

The rel="tag" attribute is a more standard (microformat) way to identify hashtag links.

Since Pleroma create hashtag links with the rel="tag" attribute in /lib/pleroma/formatter.ex#L41, it is natural to allow the rel="tag" attribute in the links in /lib/pleroma/html.ex.

Edited by Fong-Wan Chau

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