starship: add shell indicator

dotfiles/config/fish/config.fish

@@ -4,7 +4,7 @@ if test -x /opt/homebrew/bin/brew
 end
 
 if command -q starship
-  source (starship init fish --print-full-init | psub)
+  starship init fish --print-full-init | source
 end
 
 # Want this at the bottom to put this path first

dotfiles/config/starship.toml

@@ -17,3 +17,13 @@ show_always = true
 
 [ruby]
 detect_variables = []
+
+[shell]
+fish_indicator = '󰈺 '
+zsh_indicator = ''
+bash_indicator = ''
+powershell_indicator = '_'
+unknown_indicator = '??'
+style = 'cyan bold'
+disabled = false
+format = '[$indicator]($style)'