Move docs/ to docs/en/

It allows comparison between the directories and helps translations.

docs/en/README.md

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+# Documentation index
+
+> Before you look further, you probably want to start with our [getting started guide](https://github.com/KMKfw/kmk_firmware/blob/master/docs/Getting_Started.md)
+
+## Basics
+
+- [Getting Started](Getting_Started.md)
+- [Bluetooth HID](ble_hid.md): Connect keyboard to PC or mobile device using BLE
+- [Configuring KMK](config_and_keymap.md)
+- [Porting to KMK](porting_to_kmk.md): Creating a `kb.py` file for a board
+- [Debugging](debugging.md)
+- [Keycodes](keycodes.md): List of all available keycodes
+- [Officially supported microcontrollers](Officially_Supported_Microcontrollers.md)
+- [Support](support.md)
+- [Contributing](contributing.md)
+
+## Advanced
+
+- [Flashing instructions](flashing.md)
+- [Handwiring](handwiring.md): Resources helpful when handwiring a keyboard circuit
+- [Keys](keys.md): Technical explanation of key handling
+- [Scanners](scanners.md): Setting up non-default key reading
+
+## [Modules](modules.md)
+
+- [Combos](combos.md): Adds chords and sequences
+- [Layers](layers.md): Adds layer support (Fn key) to allow many more keys to be put on your keyboard
+- [ModTap](modtap.md): Adds support for augmented modifier keys to act as one key when tapped, and modifier when held.
+- [Mouse keys](mouse_keys.md): Adds mouse keycodes
+- [OneShot](oneshot.md): Adds support for oneshot/sticky keys.
+- [Power](power.md): Power saving features. This is mostly useful when on battery power.
+- [SerialACE](serialace.md): [DANGER - _see module README_] Arbitrary Code Execution over the data serial.
+- [Split](split_keyboards.md): Keyboards split in two. Seems ergonomic!
+- [TapDance](tapdance.md): Different key actions depending on how often it is pressed.
+
+### Peripherals
+
+- [ADNS9800](adns9800.md): Controlling ADNS9800 optical sensor
+- [Encoder](encoder.md): Handling rotary encoders
+- [Pimoroni trackball](pimoroni_trackball.md): Handling a small I2C trackball made by Pimoroni
+
+## [Extensions](extensions.md)
+
+- [International](international.md): Adds international keycodes
+- [LED](led.md): Adds backlight support. This is for monocolor backlight, not RGB
+- [LockStatus](lock_status.md): Exposes host-side locks like caps or num lock.
+- [MediaKeys](media_keys.md): Adds support for media keys such as volume
+- [RGB](rgb.md): RGB lighting for underglow. Will work on most matrix RGB as will be treated the same as underglow.
+- [Status LED](extension_statusled.md): Indicates which layer you are on with an array of single leds.
+
+## Language versions
+
+- [Japanese getting started](ja/Getting_Started.md)
+- [Brazilian Portuguese](https://github.com/KMKfw/kmk_firmware/tree/master/docs/ptBR)