Move docs/ to docs/en/

It allows comparison between the directories and helps translations.

docs/en/modules.md

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+# Modules
+Modules, unlike extensions, change how your keyboard works. These are meant to have
+the ability to alter the core code in any way. Unlike extensions, these are not in a
+sandbox, and can make massive changes to normal operation.
+
+## Core Modules
+These modules are provided in all builds and can be enabled. Currently offered
+modules are
+
+- [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.
+- [Split](split_keyboards.md): Keyboards split in two. Seems ergonomic!
+- [SerialACE](serialace.md): [DANGER - _see module README_] Arbitrary Code Execution over the data serial.
+- [TapDance](tapdance.md): Different key actions depending on how often it is pressed.
+- [Dynamic Sequences](dynamic_sequences.md): Records a sequence of keypresses and plays it back.
+
+### Require Libraries
+These modules can be used without specific hardware, but require additional libraries such as the `Adafruit CircuitPython Bundle`.
+
+ - [MIDI](midi.md): Adds sending MIDI data in the form of keymap entries.
+
+
+### Peripherals
+These modules are for specific hardware and may require additional libraries to function.
+- [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.
+- [AS5013 aka EasyPoint](easypoint.md): Handling a small I2C magnetic position sensor made by AMS.