[Keyboard] Add alt34 keyboard (#17223)

* Add files for alt34 keyboard

* Add link to hardware bill of materials for alt34

* Change keyboard image link to imgur

* Remove platform specific defines from rev1.h

* Remove bluetooth and sleep led rules etc

* Add GPL license header to all source code files

* Shorten comment for NKRO_ENABLE

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Simplify option usage comment in rules.mk

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Set imgur link to largest size option

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Move rules.mk into rev1 folder entirely

* Remove .noci file

* Update keyboards/alt34/rev1/rules.mk

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

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/alt34/rev1/rules.mk

@@ -0,0 +1,22 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+#   change to "no" to disable the options
+#
+BOOTMAGIC_ENABLE = no       # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = no        # Mouse keys
+EXTRAKEY_ENABLE = no        # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+
+SPLIT_KEYBOARD = yes
+LAYOUTS = split_3x5_2
+DEFAULT_FOLDER = alt34/rev1