terminal: Add unified history for shells

Added atuin for nice shell history. Trying it out for now
but seems non-intrusive enough that I will probably keep
it for a while even if I don't use it.

terminal/.config/nushell/config.nu

@@ -766,3 +766,4 @@ $env.PROMPT_INDICATOR_VI_NORMAL = "⟨ "
 $env.PROMPT_MULTILINE_INDICATOR = "::: "
 
 use ~/.cache/starship/init.nu
+source ~/.local/share/atuin/init.nu

terminal/.config/zsh/.zshrc

@@ -94,6 +94,7 @@ setopt autocd
 
 eval "$(starship init zsh)"
 eval "$(zoxide init zsh)"
+eval "$(atuin init zsh)"
 
 # Speed up autocomplete, force prefix mapping
 zstyle ':completion:*' accept-exact '*(N)'