Fix taxonomy description styling when it includes multiple paragraphs and test allowed HTML

[admturner]

Currently the taxonomy description, when displayed on the taxonomy archive page, automatically adds a decorative icon before the text. This needs to be removed, as it will appear before every paragraph in a multi-paragraph description.

Also need to test whether links and other basic HTML elements are allowed in the taxonomy description field.

[admturner]

Yes, you can use basic HTML markup in the taxonomy term description field and it doesn't get stripped out on the front end. However, you will have to type that as HTML, there is no rich text editing in the description field. The allowed HTML appears to be essentially: <strong>, <em>, and <a>.