port boards and docs

docs/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 proveded in all builds and can be enabled. Currently offered
+modules are
+
+- [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.
+- [Power](power.md): Power saving features. This is mostly useful when on battery power.
+- [Split](split_keyboards.md): Keyboards split in two. Seems ergonomic!