add mode chore nvim_theme, update example mode chore

chores/mode/nvim_theme.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# reve                              desktop environment framework
+# Yigid BALABAN <fyb@fybx.dev>                               2024
+
+# chore script
+# type      mode
+# name      nvim_theme.sh
+# desc      sends a signal to nvim to fetch desktop_mode
+# vars      none
+# reload    none
+
+kill -USR1 $(pgrep -f 'nvim')