* Add Configurator layout data for LAYOUT_hotswap
* Add LAYOUT_std60_split_num0
Requested by 李小安#9728 on QMK Discord.
Standard 60% ANSI layout for the alphanumeric region, with a split-0 Numpad.
Includes a sample keymap.
* Update Docs links on readme
* Change melody96.h to use #pragma once include guard
* Change config.h to use #pragma once include guard
* Add readme for default_std60_split_num0 keymap
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