feat: add id to figures to make them linkable.

[beckerjohannes]

Purpose

Figures used in a technical articles shall have an ID in order to be able to create an anchor link (like headings in native HUGO). See https://gohugo.io/content-management/cross-references/

For a figure:

{{< figure src="image.jpg" title="A caption" numbered="true" lightbox="true" >}}

you should be a able to do the following in markdown text:

This is some awesome text. For more please see [the awesome figure]({{< relref "#a-caption" >}}

Documentation

https://github.com/sourcethemes/academic-www/pull/20

[stale]

This issue has been automatically marked as stale because it has not had any recent activity. The resources of the Academic team are limited, and so we are asking for your help.
If this is a bug and you can still reproduce this error on the master branch, please reply with all of the information you have about it in order to keep the issue open.
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This issue will automatically close soon if no further activity occurs. Thank you for your contributions.

[beckerjohannes]

Would please consider merging this pull request? It is a minimal change. I submitted the necessary code and documentation changes.

I am using your theme to write the documentation for an open standard. The articels are often longer and I think it is very useful to have the ability to cross reference figures. Any comments?

[beckerjohannes]

You added "needs investigation". Anything with which I can assist?