* Fixes#357 by upgrading to fontawesome-free 6.3.0
* Replaced the existing font-awesome files with new ones
* Updated references in _variables.scss ro reference theme location
* Tweaked social.html to remove redundant css class
* Updating netlify.toml to more modern values
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Co-authored-by: Victoria Drake <24644237+victoriadrake@users.noreply.github.com>