bundles/users: add option for custom tmux/bash/fish configs

bundles/users/files/fish.conf

@@ -0,0 +1,23 @@
+function fish_greeting
+    uptime
+    last | grep 'still logged in'
+end
+
+function fish_prompt
+    set -l last_status $status
+
+    echo -n "$USER@${node.name}:"
+
+    set_color $fish_color_cwd
+    echo -n (pwd)
+    set_color normal
+
+    if not test $last_status -eq 0
+        set_color $fish_color_error
+        echo -n " [$status]"
+        set_color normal
+    end
+
+    echo -n '➤ '
+    set_color normal
+end