Instead of hard-coding the list of URLs to open, we'll read it from a
JSON file on the disk. The file contains a mapping of monitor names to
URLs, e.g.
```json
{
"HDMI-1": "http://my.site.one",
"HDMI-2": "http://my.site.two"
}
```
Instead of hard-coding the list of URLs to open, we'll read it from a
JSON file on the disk. The file contains a mapping of monitor names to
URLs, e.g.
```json
{
"HDMI-1": "http://my.site.one",
"HDMI-2": "http://my.site.two"
}
```