New Keyboard: Sentraq Number Pad RGB DIY Kit (#5047)

New Keyboard: Sentraq Number Pad RGB DIY Kit (#5047)

* Added QMK Config for Sentraq Number Pad keyboard.

* Sentraq Number Pad documentation cleanup.

* mend

* Added json for configurator.

* Small documentation tweaks.

* Updated the layouts to use the default layouts that match.

* Uncommended user level functions in keymap, left custom keycode/macro code commented but documented why.

* Switched to #pragma once from #ifndef structure in header file.

* Moved Sentraq number pad to sentraq creator directory.

* Renamed sentraq_number_pad to number_pad now that it's nested in the sentraq directory.

* Updated references inside the files for the keyboard rename and nesting.