Move bash_history into XDG directories

zsh/zprofile.j2

@@ -80,6 +80,9 @@ export REDISCLI_RCFILE="$XDG_CONFIG_HOME"/redisclirc
 export PYTHON_HISTORY=$XDG_STATE_HOME/python_history
 export PYTHONPYCACHEPREFIX=$XDG_CACHE_HOME/python
 
+# bash-specific
+export HISTFILE="$XDG_STATE_HOME"/bash_history
+
 umask 0022
 
 {% set env = machine.environment | combine(user.environment) %}