Pteron36 Refactor (#14904)

* reformat info.json

- friendly-format info.json
- move the right half to the left by 0.5u (improves readability, for me anyway)
- correct key sequence

* refactor default keymap

- use short-form keycodes
- use four-space indent

* refactor via keymap

- use short-form keycodes
- use four-space indent

* update maintainer field in info.json

Use the maintainer's GitHub username.

* readme touch-up

Minor edit to the lead paragraph, and reformat the Hardware Availability section.

* change BOOTMAGIC_ENABLE from `lite` to `yes`

keyboards/pteron36/rules.mk

@@ -7,7 +7,7 @@ BOOTLOADER = caterina
 # Build Options
 #   change yes to no to disable
 #
-BOOTMAGIC_ENABLE = lite     # Enable Bootmagic Lite
+BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
 MOUSEKEY_ENABLE = yes       # Mouse keys
 EXTRAKEY_ENABLE = yes       # Audio control and System control
 CONSOLE_ENABLE = no         # Console for debug