Allow different colours for link icon in author bio

[aidan-gallagher]

When I select an icon from font awesome it gives me the option to pick a colour.
You can see it has added style="color: #aab2c0;" to the generated HTML at the bottom.

I would like to use this colour in my profile so I can get all my icons to look the same, however there is no option for that in _config.yml.

Before

After

Code

I imagine the code change would be here: https://github.com/mmistakes/minimal-mistakes/blob/master/_includes/author-profile.html#L37.