inform pdoc about google doc string style

Author: FynnBe

.github/workflows/build.yaml

@@ -172,6 +172,7 @@ jobs:
       - name: Generate developer docs
         run: |
           pdoc \
+          --docformat google \
           --logo https://bioimage.io/static/img/bioimage-io-logo.svg \
           --logo-link https://bioimage.io/ \
           --favicon https://bioimage.io/static/img/bioimage-io-icon-small.svg \