Dev server improvements

[sammeltassen]

1. Properly close iiif-hss dev server process

When interrupting the dev preview process with CRTL-C, the headless IIIF server keeps running, causing an error when launching the dev server again. The following can be used to close the process:

process.on("SIGINT", () => {
  console.log("Ctrl-C was pressed");
  process.exit();
});

Source: https://bun.sh/guides/process/ctrl-c

2. Refresh IIIF content when running the dev server

Moved this feature request to:

• Dev server: refresh IIIF content upon change #20

4. Fix and improve iiif-hss dev server

The dev server includes a web portal with an overview of the IIIF data and an embedded Manifest Editor. Some of this stopped working during subsequent updates and it would be good to fix this.