[Feature request] Save sort order

[neitsab]

Hi, I guess this is a follow up on #11: would you consider adding the possibility to save the sort order into the config file?

Even though it's just a keybinding away, if I know I always want to separate official repo packages from AUR ones I'd love to be able to set it as default in pacseek.

Really great interface btw, reminds of lazygit which I love 😊

Thanks