Revert "Added -DZMK_CONFIG Documentation"

This reverts commit a9ec1148e5.

docs/docs/dev-build.md

@@ -84,19 +84,6 @@ west build -d build/right -b nice_nano -- -DSHIELD=kyria_right
 ```
 This produces `left` and `right` subfolders under the `build` directory and two separate .uf2 files. For future work on a specific half, use the `-d` parameter again to ensure you are building into the correct location.
 
-### Building from `zmk-config` Folder
-
-Instead of building .uf2 files using the default keymap and config files, you can build directly from your [`zmk-config` folder](user-setup.md) by adding 
-`-DZMK_CONFIG="C:/the/absolute/path/config"` to your `west build` command. **Notice that this path should point to the folder labelled `config` within your `zmk-config` folder.**
-
-
-For instance, building kyria firmware from a user `myUser`'s `zmk-config` folder on Windows 10 may look something like this:
-
-```
-west build -b nice_nano -- -DSHIELD=kyria_left -DZMK_CONFIG="C:/Users/myUser/Documents/Github/zmk-config/config"
-```
-
-
 ## Flashing
 
 Once built, the previously supplied parameters will be remembered so you can run the following to flash your