Add shortcode to add a resized image of the NumPy comic

[MarsBarLee]

Brief description of what is fixed or changed

Hi all,
#795 already adds a link to the NumPy comic in the Contribute page.

I want to add a version that add an image of the comic. While I could add the image directly with #795, there is no way to easily resize the image across a variety of browser sizes and devices.

This shortcode adds a comic.html so that CSS can automatically resize the image. This format is used elsewhere in the NumPy

Alternative implementation

There is also an option to embed a flippable version of the comic directly on the Contribute page. This is how Heyzine (the flipbook host) provides their embed option through the iframe tag.

<iframe allowfullscreen="allowfullscreen" scrolling="no" class="fp-iframe" style="border: 1px solid lightgray; width: 100%; height: 400px;" src="<https://heyzine.com/flip-book/3e66a13901.html>"></iframe>

I haven't tested out yet if NumPy website works nice with iframe.

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