added bell disable and todo to .zshrc.d

.zshrc.d/__available__/bell-none.zsh

+#
+
+unsetopt beep

.zshrc.d/__available__/todo.zsh

+#!/bin/sh
+#
+if [ -r ~/todo.txt ]; then
+    cat ~/todo.txt
+fi

.zshrc.d/my_defaults

 ln -vs __available__/neofetch.zsh
 ln -vs __available__/prompt_color.zsh
 ln -vs __available__/prompt_powerline.zsh
+ln -vs __available__/todo.zsh