feat: security enhancement on `VtmnLink` component

[Tlahey]

Hello,

I've found a potential security issue with the VtmnLink component. See this post -> https://twitter.com/brianthiely/status/1562102291502665728?s=21&t=27WqGeqocjEcRezD05-ziA

We need to add a noopener noreferrer when target is _blank

[thibault-mahe]

Hello @Tlahey, you are right, thanks for being vigilant! This security should also be enforced, at least, with the corresponding eslint rule for Svelte, Vue and React.

Could you make a PR please ?