dark theme doesn't match repo and is hard to read about delta HOT 4 CLOSED

Also see alacritty/alacritty#109

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Great, sorry I didn't reply to this before you fixed it! Let me know if the README can be improved.

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This seems to be an issue with tmux and alacritty, in that, 24 bit colours aren't properly set up. Adding below to my .tmux.conf fixed the issue.

set -g default-terminal "tmux-256color"
set -ga terminal-overrides ",xterm-256color:Tc"

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Note that the COLORTERM env var needs to be set correctly too. This is especially important when using delta over ssh, since ssh usually discards COLORTERM.

export COLORTERM=truecolor

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