Configure tmux truecolor terminal

.config/tmux/tmux.conf

@@ -4,6 +4,10 @@
 set -g extended-keys on
 set -g extended-keys-format csi-u
 
+# Use 256-colour tmux terminfo and advertise truecolour support to apps.
+set -g default-terminal "tmux-256color"
+set -as terminal-features ",*:RGB"
+
 # Keep a large scrollback history.
 set -g history-limit 1000000