remove workflow

.github/workflows/nodejs.yml

@@ -1,25 +0,0 @@
-name: Node CI
-
-on: [push]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        node-version: [8.x]
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
-      with:
-        node-version: ${{ matrix.node-version }}
-    - name: build docs
-      run: |
-        npm install -g gitbook-cli
-        gitbook build documentation docs
-      env:
-        CI: true