move @yangdigi 's keyboards to a YDKB folder (#15681)

keyboards/ydkb/chili/readme.md

@@ -10,6 +10,6 @@ The YDKB Chili is a Cherry G80-3000 replacement PCB utilizing the ATmega32U4 mic
 
 Make example for this keyboard (after setting up your build environment):
 
-    make chili:default
+    make ydkb/chili: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).

keyboards/ydkb/just60/readme.md

@@ -12,6 +12,6 @@ Backlight LEDs and Bluetooth are not working yet.
 
 Make example for this keyboard (after setting up your build environment):
 
-    make just60:default
+    make ydkb/just60: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).

keyboards/ydkb/yd68/readme.md

@@ -10,6 +10,6 @@ Hardware Availability: [KBDFans](https://kbdfans.cn/collections/diy-kit/products
 
 Make example for this keyboard (after setting up your build environment):
 
-    make yd68:default
+    make ydkb/yd68: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).