Support font awesome with fas and far class

[yenskr]

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Hi, I'm a big fan of hackmd.io!!

When I looked in to the feature document, I noticed that you can use font awesome by inserting a simple line of html code. like this: <i class="fa fa-file-text"></i>

However, this only works when the class is fa, when it comes to fas or far class then it shouldn't work.

Is it possible to support those classes? (Or how can I help? I only have some basics about html.)

I'm wondering if this thread is related? https://github.com/hackmdio/codimd/issues/872

Thanks for any suggestion!