use default ctrl b in tmux

dot_tmux.conf

@@ -11,12 +11,6 @@ set -g status-interval 2
 # enable mouse
 set-option -g mouse on
 
-# remap keys
-# prefix key: Ctrl+S
-unbind C-b
-set-option -g prefix C-s
-bind-key C-s send-prefix
-
 # split windows with | and ^
 bind | split-window -h
 unbind %

run_onchange_before_0_install-packages.sh

@@ -6,7 +6,7 @@ echo "Installing packages"
 echo "Updating sources..."
 sudo apt update -qq
 
-for package in xsel unzip git git-extras neovim git ripgrep; do
+for package in zsh xsel unzip git git-extras neovim git ripgrep; do
     if dpkg -s "$package" >/dev/null 2>&1; then
         echo $package is already installed.
     else