The toc is not clickable, the h-elements do not have the correct id

[N7K4]

The toc (<ul></ul>) is not clickable. The h-elements (h1, h2, h3 ...) do not have the correct id or the id is missing at all.

[codenitpicker]

If content isn't rendered using {{ content | markdownify}} the h elements are not given an ID so the toc doesn't link correctly on click.

This would be a great addition if it could be added to the inject_anchors.

@N7K4 was this pull request adding h elements id's using inject_anchors? #109