image URLs via markdown

[kriemo]

The knitr::include_graphics() function doesn’t seem to be working correctly on windows when loading from URL. Use the following markdown syntax instead.

![text caption](URL)

[MLKaufman]

Using the following in the markdown sections also works and allows overriding of the css styling to allow custom parameters like width and height:

<img src="https://github.com/rnabioco/bmsc-7810-pbda/blob/main/_posts/2022-11-17-class-4-intro-to-ggplot2/img/ggplot2.png?raw=true" style="width: 300px;">