NOTE: this theme is outdated, I currently don't have time to maintain or update it, so if anyone is interested in maintaining it feel free to DM me
Drop the challenger_deep.toml file into your themes folder, it's located on the runtime folder,
the runtime folder is located on ~/.config/helix/runtime on Linux and MacOS, and on %AppData%/helix/runtime on windows,
if it isn't there check your HELIX_RUNTIME env variable
