feat: support rel attribute for social links

[jdebarochez]

Following issue #128, I'm proposing this implementation, up for debate. I was not finding a cleaner way to introduce this without a method.

Here's the generated output, with the me added:

<a href="https://m.webtoo.ls/@nuxt" rel="noopener noreferrer me" target="_blank" title="Mastodon" aria-label="Mastodon" data-v-c22758af="">{{ icon }}</a>

I've tested when socials has a rel property or not. Do you see other test to perform?

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