Update docs and Test workflows for xiao

.github/workflows/test-all-xiao-shields.yml

@@ -0,0 +1,13 @@
+# Copyright 2022 Manna Harbour
+# https://github.com/manna-harbour/miryoku
+
+name: 'Test All Xiao Shields'
+on:
+  - workflow_dispatch
+jobs:
+  build:
+    if: github.repository_owner == 'manna-harbour'
+    uses: manna-harbour/zmk-config/.github/workflows/main.yml@31a649e5571b4572d7010561dd3f191922cd9410
+    with:
+      board: '["seeeduino_xiao"]'
+      shield: '["hummingbird","zaphod_lite"]'