Move github workflow file

Author: Lévai Norbert

docs/.github/workflows/deploy-docs.yml renamed to .github/workflows/deploy-docs.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up Node.js
         uses: actions/setup-node@v3
@@ -20,6 +20,9 @@ jobs:
       - name: Install dependencies
         run: npm install
 
+      - name: Clean everthing and install dependencies
+      run: npm ci
+
       - name: Build VuePress
         run: npm run docs:build