Add Mkdocs plugins to pip install.

.github/workflows/docs.yaml

@@ -24,5 +24,5 @@ jobs:
           path: .cache
           restore-keys: |
             mkdocs-material-
-      - run: pip install mkdocs-material
+      - run: pip install mkdocs-material mkdocstrings-python mkdocs-autorefs
       - run: mkdocs gh-deploy --force

.github/workflows/test.yaml

@@ -2,8 +2,6 @@ name: test
 
 on:
   pull_request:
-  push:
-    branches: [main]
 
 jobs:
   test: