[Enhancement]: Partial to add more toc-like boxes

[jpf91]

What you'd like to propose?

I think it'd be nice to be able to add custom infoboxes next to the toc box.

The main reason I want this is for showing articles in a series, but there might be other usecases. Example:

Where the first box would be rendered using the new partial. This also needs some minor html/css adjustments: As we could have either ToC or Series or both in an article, we should not set margin-bottom: 40px on the toc. Instead, we need to intoduce a new div which wraps all those boxes, set margin-bottom: 40px on that one and set margin-bottom:10px or something like that on the boxes.

What do you think? If you think this is a reasonable feature, I can open a PR.

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