[Issue] Add option to copy anchor links from article

[lealceldeiro]

What is the issue about?

I'd like to have an option to copy the direct link to a section of an article.

Let's say there's an article "hello word". Inside that article the're a section (h2) with title: "How to start".

I'd like to have at the left of the text How to start an element (maybe shown only on hover) which when clicked copies to the clipboard the direct link to that section of the article (example: https://lealceldeiro.github.io/articles/2024/hello-word.html#how-to-start).

For this to work, first, every header (or relevant article section) must declare a valid id for the html element. Second: the copy to clipboard feature must be implemented -- related to #15 --

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