reload config on sighup

[lolbinarycat]

Is your feature request related to a problem? Please describe. i have several terminal windows open, using kitty --single-instance.

the only way i've found to fix this is to find the pid of kitty using htop, kill the process, and restart Describe the solution you'd like like other long-running processes, kitty should reload its config after getting a SIGHUP signal

[kovidgoyal]

Read the first couple of paragraphs of https://sw.kovidgoyal.net/kitty/conf/