[Keyboard] Add "Uno" rev2 (#14071)

* [Keyboard] Add "Uno" rev2

Adds support for the second revision of Uno, courtesy of @Snipeye.

* Update keyboards/uno/rev2/rules.mk

* Update keyboards/uno/rev1/rules.mk

* Update keyboards/uno/uno.h

* Update keyboards/uno/rev2/rules.mk

* Update keyboards/uno/rev1/rules.mk

* Update keyboards/uno/keymaps/demo/keymap.c

* Update keyboards/uno/keymaps/demo/keymap.c

* Update keyboards/uno/keymaps/demo/keymap.c

* Update keyboards/uno/rev2/rules.mk

* Update keyboards/uno/rev1/rules.mk

* Align rules.mk comments

* Update keyboards/uno/info.json

* Update keyboards/uno/rev1/config.h

* Update keyboards/uno/rev2/config.h

* Update keyboards/uno/rev2/config.h

* Update keyboards/uno/rev2/config.h

* Update keyboards/uno/rev1/config.h

keyboards/uno/keymaps/default/readme.md

@@ -1,4 +1,5 @@
 # The default keymap for uno
-![Keymap](https://i.imgur.com/lCPZZpO.png)
+![Picture](https://i.imgur.com/OqPyWbbl.jpg)
 
-The 'Macro' key does a few things: If you open up textedit (was made for a mac), it sends "Command+n" for the first press to make a new document.  It then types a few different messages, activates the RGB LED, and finally ends in a "scroll through the alphabet with a long press to confirm a certain character" keyboard mode.
+This keymap types "Hello!" when pressed and presses 'A' and 'B' when turning the
+encoder.