Adds aria-labels to svg social icon links

[jeanadev]

Fixes for #1088

This code could probably be refactored to include less repeating (DRY).

But now svg icon links meet the WCAG 2.4.4 https://www.w3.org/TR/2008/REC-WCAG20-20081211/#navigation-mechanisms-refs. Also see: https://www.w3.org/WAI/WCAG21/Techniques/aria/ARIA8.html

Thanks to Adam Tegan for helping me out with understanding the svelt to get this far.

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[theClarkSell]

@all-contributors add @tsidel for code

[allcontributors]

@csell5

I've put up a pull request to add @tsidel! 🎉