Is this needed anymore:
@import url("https://use.fontawesome.com/releases/v5.13.0/css/all.css");
And should this be edited:
<script type="text/discourse-plugin" version="0.8">
api.replaceIcon('d-post-share', 'share-alt');
api.replaceIcon('d-topic-share', 'share-alt');
api.replaceIcon("far-beer", "beer");
</script>