Adding VIA support for CannonKeys/Practice60 (#8169)

* Adding VIA support for 40percentclub/luddite

* Update config.h

* Update rules.mk

* Delete config.h

config.h was created to override the "default" of RGBLED_NUM 8
deleting the file to keep with defaults

* Removing block and comment as suggested

* Update PRODUCT_ID

Changing from:

 #define PRODUCT_ID      0x0A0C 

To:

 #define PRODUCT_ID      0x4C55 // "LU"

* Changing Vendor ID

Changing Vendor ID from:
#define VENDOR_ID       0xFEED
To:
#define VENDOR_ID       0x3430 // "40"

* Adding VIA support to cannonkeys/practice60

Adding VIA support to cannonkeys/practice60

 * updated VENDOR_ID to match other CannonKeys boards
 * changed PRODUCT_ID to be unique
 * added additional notes to readme.md
 * keymap.c and config.h for VIA support

* Update readme.md

* Update keyboards/cannonkeys/practice60/readme.md

* Update keyboards/cannonkeys/practice60/readme.md

* Update keyboards/cannonkeys/practice60/config.h

* Update rules.mk

* Update keyboards/cannonkeys/practice60/config.h

* Update config.h

* Rebased from Master

Rebased from Master

keyboards/cannonkeys/practice60/readme.md

@@ -9,4 +9,11 @@ Make example for this keyboard (after setting up your build environment):
 
     make cannonkeys/practice60:default
 
+Flashing example for this keyboard:
+
+    make cannonkeys/practice60:default:flash
+
 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).
+
+Build guide available at: https://docs.cannonkeys.com/bluepill-build/
+Blue Pill flashing guide at: https://docs.cannonkeys.com/flashing/