Move "UNO" product categories to "UNO Family" parent category

Previously, these categories were placed under the "Classic" parent category. That classification made increasingly less
sense over time as new cutting edge products in the UNO form factor were created.

Author: per1234

content/categories/official-hardware/classic/uno-r3/_pins.md

@@ -8,4 +8,4 @@
 
 ## Published At
 
-https://forum.arduino.cc/c/official-hardware/classic/uno-r3/204
+https://forum.arduino.cc/c/official-hardware/uno-family/uno-r3/204

content/categories/official-hardware/classic/uno-r3/README.md renamed to content/categories/official-hardware/uno-family/uno-r3/README.md

@@ -8,4 +8,4 @@
 
 ## Published At
 
-https://forum.arduino.cc/c/official-hardware/classic/uno-r4-minima/188
+https://forum.arduino.cc/c/official-hardware/uno-family/uno-r4-minima/188