[Keyboard] move g heavy industry boards into /gboards (#16040)

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

keyboards/gboards/butterstick/readme.md

@@ -9,6 +9,6 @@ Hardware Availability: [g Heavy Industries](https://www.gboards.ca/product/butte
 
 Make example for this keyboard (after setting up your build environment):
 
-    make butterstick:default
+    make gboards/butterstick:default
 
 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).

keyboards/gboards/ergotaco/keymaps/default/readme.md

@@ -1,6 +1,6 @@
 This is the default keymap for the ErgoTaco, Make it your own!
 
 ## Settings
-To edit various settings, enable the 1u trackball and whatnot please modify /keyboards/ergotaco/keymaps/default/rules.mk
+To edit various settings, enable the 1u trackball and whatnot please modify /keyboards/gboards/ergotaco/keymaps/default/rules.mk
 
 Ideally you should copy this directory and make your changes there. If you come up with a good layout submit a PR!

keyboards/gboards/ergotaco/readme.md

@@ -11,13 +11,13 @@ Hardware Availability: [gboards.ca](http://gboards.ca)
 ## Firmware building
 Clone the QMK Repo and install dfu-programmer, flash with:
 
-    make ergotaco:default:dfu
+    make gboards/ergotaco:default:dfu
 
 And reset your keyboard!
 
 To just test if your build system is sane, try compiling the default keymap using:
    
-    make ergotaco:default
+    make gboards/ergotaco:default
 
 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).