Img tag transparency

[WiseNat]

Currently, all images are given the markdown-body img class which in turn has the property background-color: #1362

This means that if you place an image with transparency inside a code block for example, it will show white where you would expect transparency. The markdown for the following produces the image below (baring in mind that the SVG given has a transparent background -

<code><img width=32 src="res/github.svg"> Github</code>

[github-actions[bot]]

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