Massive update for all boards

boards/keebio/iris/README.md

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+# Iris Rev 2
+
+A split keyboard with a 4x6 layout with additional 4 thumb buttons
+
+kb.py is designed to work with the nice!nano
+kb_converter.py is designed to work with an itsybitsy with converter board found [here](https://github.com/KMKfw/kmk_firmware/tree/master/hardware)
+
+Extentions enabled by default  
+- [Layers](https://github.com/KMKfw/kmk_firmware/tree/master/docs/layers.md) Need more keys than switches? Use layers.
+- [RGB](https://github.com/KMKfw/kmk_firmware/tree/master/docs/rgb.md) Light it up
+- [BLE_Split](https://github.com/KMKfw/kmk_firmware/tree/master/docs/split.md) Connects halves without wires
+
+Common Extentions
+- [Split](https://github.com/KMKfw/kmk_firmware/tree/master/docs/split.md) Connects halves using a wire
+- [Power](https://github.com/KMKfw/kmk_firmware/tree/master/docs/power.md) Powersaving features for battery life