Feature request: accessible SVGs

[kevinrenskers]

As the icons are always inlined, there's no <img> tag to add an alt text to. To solve this with inlined <svg> elements, you'd normally add a <title> tag inside the <svg> tag - see https://css-tricks.com/accessible-svgs/#aa-2-inline-svg.

Can you add this to svelte-fa? I'd like our icons to be accessible, which they are not at the moment.