Keyboard: Bpiphany Pegasus Hoof Refactor, Configurator support (#4649)

Keyboard: Bpiphany Pegasus Hoof Refactor, Configurator support (#4649)

* Pegasus Hoof: layout macro refactor

- Renamed KEYMAP to LAYOUT
- Added LAYOUT_tkl_ansi macro
- white space changes (changed tabs for 2 spaces)

* Pegasus Hoof: keymap refactor

- updated layout macro names
- changed to #include QMK_KEYBOARD_H
- removed redundant KC_TRNS definitions
- white space changes (changed tabs to spaces)
- removed deprecated build script instructions from rules.mk files
- updated config.h to #pragma once

* Pegasus Hoof: Configurator support

* Pegasus Hoof: readme cleanup

- Reformat header and description paragraph
- Fix Hardware Availability link (was 404)
- renamed filename to lowercase

* Pegasus Hoof: add LAYOUTS = tkl_ansi to rules.mk

* Pegasus Hoof: fix LAYOUT_tkl_jis macro