Fetch image immediately before presenting/sending #4
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Closes #1 with a slightly more modern approach that also prefetches the image before emailing it from the sentinel.
The only marginally-significant loss between that PR and this one is that I decided the
HTTPResponseErrorclass was overkill over just throwing anew Error. If I ever refactor this project to be more of a Service-Weaver-esque monolith, I might reintroduce that as art of a lightweight internal module (ie. as the error thrown by a wrapper aroundfetchif the status is not 200).