update docs

.github/workflows/check_submodules.yml

@@ -1,17 +0,0 @@
-name: 'Check submodules'
-
-on:
-  pull_request:
-
-jobs:
-  protobuf:
-    runs-on: ubuntu-latest
-    steps:
-    - name: 'Checkout code'
-      uses: actions/checkout@v2
-    - name: 'Check submodule commit branch'
-      uses: jtmullen/submodule-branch-check-action@v1
-      with:
-        path: assets/protobuf
-        branch: dev
-        fetch_depth: 50