Update tmux-session search-dir order, add btop config

src_files/.config/zsh/.zshenv

@@ -26,6 +26,9 @@ export XDG_STATE_HOME="$DIR_LOCAL/state"
 export XDG_DATA_DIRS="/usr/local/share:/usr/share"
 #export XDG_CONFIG_DIRS="/etc/xdg" # TODO: does this work on macOS?
 
+# directory for theme/style stuff
+export DIR_THEME_SETTINGS="$XDG_CONFIG_HOME/this-box-theme"
+
 # zsh
 export ZDOTDIR="$XDG_CONFIG_HOME/zsh" # may already be set, set anyway