Deleted as recommended.

app/boards/shields/leeloo/boards/nice_nano.overlay

@@ -1,29 +0,0 @@
-&spi1 {
-	compatible = "nordic,nrf-spim";
-	/* Cannot be used together with i2c0. */
-	status = "okay";
-	mosi-pin = <6>;
-	// Unused pins, needed for SPI definition, but not used by the ws2812 driver itself.
-	sck-pin = <5>;
-	miso-pin = <7>;
-
-	led_strip: ws2812@0 {
-		compatible = "worldsemi,ws2812-spi";
-		label = "SK6812mini";
-
-		/* SPI */
-		reg = <0>; /* ignored, but necessary for SPI bindings */
-		spi-max-frequency = <4000000>;
-
-		/* WS2812 */
-		chain-length = <6>; /* There are per-key RGB, but the first 6 are underglow */
-		spi-one-frame = <0x70>;
-		spi-zero-frame = <0x40>;
-	};
-};
-
-/ {
-	chosen {
-		zmk,underglow = &led_strip;
-	};
-};