[Keyboard] support for Stack Overflow The Key from Drop - adapted from @frap129 (#15520)

* support for Stack Overflow The Key from Drop - adapted from @frap129

* addressing code review comments

there's still some issues related to LEDs so i think for now the best
course of action is to remove those items until we can get better
details on the assembly of the board.

* removing this on the correct branch

* cleaning up more code review comments, moving to simpler/common formats for maps

* it is a C not a G fool

* well, looks like you can do it this way too for booting/dfu

* fixing missing newline for gcc to be quiet

* removing busted links

* formatting to match current template

* Update keyboards/massdrop/thekey/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

Co-authored-by: Andy Piper <andypiper@users.noreply.github.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/massdrop/thekey/rules.mk

@@ -0,0 +1,18 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = no        # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = yes        # Console for debug
+COMMAND_ENABLE = yes        # Commands for debug and configuration
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output