[Keyboard] move yiancar's boards into yiancardesigns/ (#15781)

keyboards/yiancardesigns/barleycorn/readme.md

@@ -10,11 +10,11 @@ An f-row less compact 1800 kit with only through hole components.
 
 Make example for this keyboard (after setting up your build environment):
 
-    make barleycorn:default
+    make yiancardesigns/barleycorn:default
 
 Flashing example for this keyboard:
 
-    make barleycorn:default:flash
+    make yiancardesigns/barleycorn:default:flash
 
 Bootloader:
 use usbasploader from HSGW's repository.

keyboards/yiancardesigns/gingham/readme.md

@@ -10,11 +10,11 @@ Hardware Availability: https://yiancar-designs.com/, https://novelkeys.xyz, http
 
 Make example for this keyboard (after setting up your build environment):
 
-    make gingham:default
+    make yiancardesigns/gingham:default
 
 Flashing example for this keyboard:
 
-    make gingham:default:flash
+    make yiancardesigns/gingham:default:flash
 
 Bootloader:
 use usbasploader HSGW's my repository.

keyboards/yiancardesigns/seigaiha/readme.md

@@ -10,11 +10,11 @@ An alice layout kit with only through hole components.
 
 Make example for this keyboard (after setting up your build environment):
 
-    make seigaiha:default
+    make yiancardesigns/seigaiha:default
 
 Flashing example for this keyboard:
 
-    make seigaiha:default:flash
+    make yiancardesigns/seigaiha:default:flash
 
 Bootloader:
 use usbasploader from HSGW's repository.