40percentclub sixpack support (#11007)

* QMK support for 40percentclub SixPack

* Update readme.md

* QMK support for 40percentclub SixPack

* fix info.json

* Apply suggestions from code review

Co-authored-by: Joel Challis <git@zvecr.com>

* update PRODUCT name and change BL levels to 6

* Add Fkeys keymap

* correct readme

* add via keymap

* correct readme

* change indentation

* Apply suggestions from code review

Co-authored-by: Ryan <fauxpark@gmail.com>

* requested change and more cleanup

* Update keyboards/40percentclub/sixpack/sixpack.h

Co-authored-by: Erovia <Erovia@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Suschman <suschman@gmail.com>
Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Erovia <Erovia@users.noreply.github.com>

keyboards/40percentclub/sixpack/info.json

@@ -0,0 +1,15 @@
+{
+    "keyboard_name": "sixpack",
+    "url": "https://www.40percent.club/2017/05/six-pack-11.html",
+    "maintainer": "qmk",
+    "width": 3,
+    "height": 2,
+    "layouts": {
+        "LAYOUT_ortho_2x3": {
+          "layout": [
+                {"x":0, "y":0}, {"x":1, "y":0}, {"x":2, "y":0},
+                {"x":0, "y":1}, {"x":1, "y":1}, {"x":2, "y":1}
+          ]
+        }
+    }
+}