Add options to FileAttachment(…).image() #231
Description
In https://github.com/observablehq/stdlib/blob/main/src/fileAttachment.js#L43 it would be interesting to add options such as:
- width
- height
- alt
- title
- intrisicsize
- styles
longdesc
A short-hand notation for "half-size" would also be useful (maybe {pixelRatio: 2}?) currently, when you upload a screenshot taken on a retina screen, you need to look up the image's width, then write a full <img src="….url()" width="W/2"> tag.