[Keyboard] move @monksoffunk 's boards into 25keys/ (#15789)

keyboards/25keys/aleth42/readme.md

@@ -10,6 +10,6 @@
 
 Make example for this keyboard (after setting up your build environment):
 
-    make aleth42:default
+    make 25keys/aleth42/rev1: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/25keys/cassette42/config.h

@@ -49,4 +49,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #    define RGBLIGHT_ANIMATIONS
 #endif
 
-#define OLED_FONT_H "keyboards/cassette42/common/glcdfont.c"
+#define OLED_FONT_H "keyboards/25keys/cassette42/common/glcdfont.c"

keyboards/25keys/cassette42/readme.md

@@ -10,6 +10,6 @@ An audio control pad with 4 switches and 2 rotary encoders.
 
 Make example for this keyboard (after setting up your build environment):
 
-    make cassette42:default
+    make 25keys/cassette42: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).