Trazendo recursos populares para Discourse: busca no cabeçalho, banner de boas-vindas e ícones / emojis de categorias

[Heliosurge (Dan DeMontmorency)]

@lindsey

Category icons and emoji

You can now use icons and emoji to distinguish categories, instead of the colored square.

This is quite awesome add! Thank you! Combined with custom emoji adds impressive customization capabilities!