[Keyboard] move @Biacco42 's keebs into /biacco42 (#16080)

keyboards/biacco42/ergo42/ergo42.h

@@ -2,6 +2,6 @@
 
 #include "quantum.h"
 
-#ifdef KEYBOARD_ergo42_rev1
+#ifdef KEYBOARD_biacco42_ergo42_rev1
     #include "rev1.h"
 #endif

keyboards/biacco42/ergo42/readme.md

@@ -11,6 +11,6 @@ A split 7x4 ortholinear keyboard. [Hardware project repo](https://github.com/Bia
 
 Make example for this keyboard (after setting up your build environment):
 
-    make ergo42/rev1:default:flash
+    make biacco42/ergo42/rev1:default:flash
 
 See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).

keyboards/biacco42/ergo42/rules.mk

@@ -19,4 +19,4 @@ AUDIO_ENABLE = no           # Audio output
 
 SPLIT_KEYBOARD = yes
 
-DEFAULT_FOLDER = ergo42/rev1
+DEFAULT_FOLDER = biacco42/ergo42/rev1

keyboards/biacco42/meishi/readme.md

@@ -13,7 +13,7 @@ Hardware Availability: [Tanoshi life - Booth](https://biacco42.booth.pm/)
 Make example for this keyboard (after setting up your build environment):
 
 ```
-$ make meishi:default:avrdude
+$ make biacco42/meishi:default:avrdude
 ```
 
 See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.

keyboards/biacco42/meishi2/readme.md

@@ -10,6 +10,6 @@ Hardware Availability: [links to where you can find this hardware](https://githu
 
 Make example for this keyboard (after setting up your build environment):
 
-    make meishi2:default
+    make biacco42/meishi2:default
 
 See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).