Use non-config directory to install plugins

Makes the tmux config directory much more shareable as the plugins would
install to this checked-in directory caused by the symbolic link, so
either we ignore the directory or move the plugin install location. In
this case the latter made sense and is discussed further in this issue
tmux-plugins/tpm#215.

Author: RossBarnie

tmux/.config/tmux/tmux.conf

@@ -38,13 +38,15 @@ set -g @catppuccin_flavour 'mocha'
 set -g @catppuccin_no_patched_fonts_theme_enabled on
 set -g @catppuccin_host on
 
+set-environment -g -F TMUX_PLUGIN_MANAGER_PATH "${XDG_DATA_HOME}/tmux/plugins"
+
 set -g @plugin 'tmux-plugins/tpm'
 set -g @plugin 'tmux-plugins/tmux-sensible'
 set -g @plugin 'christoomey/vim-tmux-navigator'
 set -g @plugin 'catppuccin/tmux'
 set -g @plugin 'tmux-plugins/tmux-yank'
 
-run '~/.tmux/plugins/tpm/tpm'
+run "${XDG_DATA_HOME}/tmux/plugins/tpm/tpm"
 
 # set vi-mode
 set-window-option -g mode-keys vi

zsh/dot-zshenv

@@ -3,4 +3,5 @@ export EDITOR=$VISUAL
 
 export PATH="$HOME/.bin:$HOME/.rbenv/bin:/usr/local/bin:$HOME/.rbenv/shims:$PATH"
 export XDG_CONFIG_HOME="$HOME"/.config
+export XDG_DATA_HOME="$HOME"/.local/share