Switched Font Awesome to version 5
Font Awesome since version 5 allows has much more social icons (mastodon, goodreads, steam, keybase to name the few) so I think it would be good idea to update.
Since v5 class fa
has changed to fab
for brands, fas
for solids etc. so adding class name for each icon in social.toml
and removing class name in footer file makes transition smooth.