Warning
devicons is currently undergoing maintenance.
Anyone who wants to use devicons now should uninstall it with lpm (if it was previously installed) and just copy/paste the devicons.lua and devicons.ttf files.
Open a terminal window and run the following commands:
lpm repo add "https://github.com/PerilousBooklet/lite-xl-devicons"
lpm install deviconsFollow the official guide ...