Add pagebreak control for numbered pagination links

[bglw]

Something along the lines of the following should be an achievable output:

<a href="../2/">Previous Page</a>

<ol>
  <li> <a href="../../">Page 1</a> </li>
  <li> <a href="../2/">Page 2</a>  </li>
  <li> <a href=".">Page 3</a>      </li>
</ol>

<a href="../4">Next Page</a>

[bglw]

I don't yet know how to spec this. My initial idea was to have a data-pagebreak-control you can add for Page 1. Pagebreak would then add siblings to this element for subsequent pages.

This doesn't work for the above example, the a tag would logically have a data-pagebreak-control attribute so it can update the text and the URL, but the li tag is the element that needs to be cloned into siblings.

We could do some magic here and try to traverse up to a list element that would logically be cloned. Otherwise just duplicate the <a> tag.

This would make the spec look like:

<ol>
  <li> <a data-pagebreak-control="crumb"> Page <span data-pagebreak-label="crumb">3</span> </a> </li>
</ol>

Where some magic duplicates it on the <li>, and updates the crumb control & label

[bglw]

Leaving this to simmer until the best spec is established. 1.0 is viable without the page crumbs.