[Keyboard] Refactor HB85 to get rid of custom i2c code (#5570)

* remove dependency on custom i2c code

* missed a pragma once

* fix readme install instructions

* config.h cleanup

* make the bootmagic key not the same bmc reset key

* disable bootmagic functionality as it doesn't seem to work on atmega32a bmc boards

keyboards/gray_studio/hb85/config.h

@@ -19,8 +19,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #define VENDOR_ID       0x20A0
 #define PRODUCT_ID      0x422F
-// TODO: share these strings with usbconfig.h
-// Edit usbconfig.h to change these.
 #define MANUFACTURER    Gray Studio
 #define PRODUCT         HB85
 
@@ -34,6 +32,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #define RGBLED_NUM 5
 #define RGBLIGHT_ANIMATIONS
-
-#define NO_UART 1
-#define BOOTLOADHID_BOOTLOADER 1