Convert zaphod-config to a module.

README.md

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+Zaphod and Zaphod Lite ZMK Config
+=================================
+
+This configuration may be used independently as a ZMK config as
+described in https://zmk.dev/docs/development/build-flash#building-from-zmk-config-folder
+or it can be included as a module.
+
+Using This Config as a Module
+-----------------------------
+
+Add this repository to your `config/west.yml` in the `remotes` and
+`projects` sections, adding the following snippets alongside the
+entries that are already there.
+
+```yaml
+  remotes:
+    - name: zaphod
+      url-base: https://github.com/petejohanson
+  projects:
+    - name: zaphod-config
+      remote: zaphod
+      revision: main
+```

zephyr/module.yml

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+---
+name: zephyr-config
+build:
+  settings:
+    board_root: .