Font Awesome icons in CSS with 2.3

Chris D said:
You will need to look into how we add icons to templates and use that approach,
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Is there any documentation available on this, especially re using in CSS?

For example previously I add category icons using before pseudo elements in extra.less:

Code:

.block.block--category.block--category28 .block-header:before {
    .m-faBase();
    content: '\f001';
    float: left;
    padding-right: 5px;
}

How would I do that now?

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