Move docs/ to docs/en/

It allows comparison between the directories and helps translations.

docs/en/Officially_Supported_Microcontrollers.md

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+# Officially supported microcontrollers
+While most CircuitPython devices are great for hand wired keyboards, most
+keyboards are designed to accept a Pro Micro. The boards listed below either 
+are, or can be adapted to that pinout to use common keyboards already on the market.
+
+## nice!nano
+Features include
+- Pro Micro pinout
+- Both USB HID and Bluetooth support
+- Can do Bluetooth split keyboards with no wires at all
+- Has battery support including charging
+
+Downsides
+- $25 USD per microcontroller at most retailers
+- Not enough space to run KMK without compiling
+
+### Pre-compiling KMK for nice!nano
+As the nice!nano has limited flash memory you'll need to compile KMK. To do that you'll need to download and install the [compatible mpy-cross](https://adafruit-circuit-python.s3.amazonaws.com/index.html?prefix=bin/mpy-cross/) for your Operating System. Don't forget to add it to your PATH, test by running `mpy-cross` from a shell (Powershell, Bash, Fish, etc). Once that's set up, run either `make compile` (if you have `make`) or `python util/compile.py`to generate the `.mpy` versions of KMK files. Then copy the whole compiled `kmk/` directory to your keyboard.
+
+
+Common Retailers
+- [Boardsource](https://boardsource.xyz/store/5f4a1733bbaa5c635b83ed67)
+- [Nice Keyboards](https://nicekeyboards.com/nice-nano/)
+
+## ItsyBitsy M4 Express
+Features include
+- Affordable at $15 USD
+- Can run most features of KMK including RGB
+
+Downsides
+- Needs adapted to work with Pro Micro pinout keyboards. Adapter can be found 
+[HERE](https://github.com/KMKfw/kmk_firmware/tree/master/hardware)
+
+Common Retailers
+- [Adafruit](https://www.adafruit.com/product/3800)
+
+## RP2040
+Features include
+- Very affordable
+- Very powerful for the price
+
+Downsides
+- Little support for keyboard kits
+
+Common Retailers
+- [Adafruit](https://www.adafruit.com/pico?src=raspberrypi)
+- [SparkFun](https://www.sparkfun.com/products/17829?src=raspberrypi)
+
+## Adafruit ItsyBitsy nRF52840 Express
+Features include
+- Both USB HID and Bluetooth support
+- More affordable than the nice!nano at only $18
+
+Downsides
+- Needs adapted to work with Pro Micro pinout keyboards. Adapter can be found
+[HERE](https://github.com/KMKfw/kmk_firmware/tree/master/hardware)
+- No battery support without addon board found 
+[HERE](https://www.adafruit.com/product/2124) 
+
+Common Retailers
+- [Adafruit](https://www.adafruit.com/product/4481)
+
+## Other microcontrollers
+What you'll need to have at minimum
+- CircuitPython
+- 256KB of flash storage
+- HID over USB and/or Bluetooth.