Sane defaults for tmux with more visible statusbar

note, May 25, 2023 on Mitja Felicijan's blog

# Remap prefix from 'C-b' to 'M-a'.
-unbind C-b
-set-option -g prefix M-a
-bind-key M-a send-prefix
-
-# Split panes using | and -.
-bind | split-window -h
-bind - split-window -v
-unbind '"'
-unbind %
-
-# Start counting windows with 1.
-set-option -g allow-rename on
-set -g base-index 1
-setw -g pane-base-index 1
-
-# Statusbar: purple bg and white fg.
-set -g status-bg '#480b8e'
-set -g status-fg '#ffffff'
-
-# Active window: black bg and white fg. 
-set -g window-status-current-format "#[fg=#ffffff]#[bg=#111111]#[fg=#ffffff]#[bg=#111111] #I:#W #[fg=#ffffff]#[bg=#111111]"
-
-# Disable mouse mode (tmux 2.1 and above).
-set -g mouse off
-