This is a bugfix release that focuses on `web_monitoring_diff.html_diff_render` and the server.

- Fix an issue where the diffing server could reset the process pool that manages the actual diffs multiple times unnecessarily, leading to wasted memory and CPU. If you are tracking logs and errors, this will also make error messages about the diffing server clearer — you’ll see “BrokenProcessPool” instead of “'NoneType' object does not support item assignment.” (#38)

- Ensure the server shuts down gracefully when pressing `ctrl+c` or sending a `SIGINT` signal. (#44)

- Fix `web_monitoring_diff.html_diff_render` to make sure the spacing of text and tags in the HTML source code of the diff matches the original. This resolves display issues on pages where CSS is used to treat spacing as significant. (#40)

- Improve handling of lazy-loaded images in `web_monitoring_diff.html_diff_render`. When images are lazy-loaded via JS, they usually use the `data-src` or `data-srcset` attributes, and we now check those, too. Additionally, if two images have no detectable URLs, we now treat them as the same, rather than different. (#39)

- Stop showing inline scripts and styles in `web_monitoring_diff.html_diff_render`. These still get wrapped with `<del>` or `<ins>` elements, but they don’t show up visually since they aren’t elements that should be visually rendered. (#43)