add copiable anchor links to headings

[Kiarokh]

All documentation pages have this feature that allows readers to copy a link of the specific section within a page, and send it to others. Normally this copy-link feature appears on hover, beside headings (h1, h2, etc…) within the text.

In our case, we badly need this feature in Lime Elements docs, when you wanna send people to a certain example that explains a certain feature, prop, or similar.

The first line of comment block that you write in the example file will be converted to an h5 element in the DOM, like below:

<div id="root"><h5>Some heading</h5></div>

So if we get that to have an id, we will be able to use it as an anchor link, like below:

<div id="root"><h5 id="some-heading">Some heading</h5></div>

This way we can navigate to this section of the documentations, by adding the id inside the url of a page in the docs.