Refactoring the Plugin

Key steps you need to take first as you refactor the naming of the plugin elements.

Refactoring this plugin as your own:

1. Refactor all occurrences of the name Starter_Plugin, starter_plugin, starter-plugin, and Starter Plugin with you're own plugin name for the `disciple-tools-starter-plugin.php and admin-menu-and-tabs.php files.
2. Update the README.md and LICENSE
3. Update the translation strings inside default.pot file with a multilingual software like POEdit, if you intend to make your plugin multilingual.