Enable Nushell shell integration

BROKEN.md

@@ -2,6 +2,9 @@
 
 - QT theme doesn't work.
 
+- Nushell custom prompt title does not work, as it gets
+  overriden by the shell integration in a split second.
+
 - Nix Super errors, saying it expected an attrset and got a
   trunk when evaluating the non-outputs section. This should
   work, as it is an advertised feature (And it does! Don't get

modules/nushell/configuration.nix.nu

@@ -8,7 +8,7 @@ $env.config = {
   float_precision:                  2
   footer_mode:                      25
   render_right_prompt_on_last_line: false
-  shell_integration:                false
+  shell_integration:                true
   show_banner:                      false
   use_ansi_coloring:                true
   use_grid_icons:                   true