Fix sluggish fish startup

cf. edc/bass#92

fish/config.fish

@@ -1,18 +1,12 @@
-bass source "$HOME/.profile"
+bass source .profile
 set --unexport fish_greeting
 fish_vi_key_bindings
 
-for config in (find "$XDG_CONFIG_HOME/" -name 'config.fish')
-    if [ "$config" != (status -f) ]
-        source $config
-    end
-end
-
-for function_d in (find "$XDG_CONFIG_HOME/" -name functions -type d)
+for function_d in (find "$XDG_CONFIG_HOME/" -maxdepth 3 -name functions -type d)
     set fish_function_path "$function_d" $fish_function_path
 end
 
-for completion_d in (find "$XDG_CONFIG_HOME/" -name completions -type d)
+for completion_d in (find "$XDG_CONFIG_HOME/" -maxdepth 3 -name completions -type d)
     set fish_completion_path "$completion_d" $fish_completion_path
 end