update deploy.yml to use yarn

Author: davidfrigolet

.github/workflows/deploy.yml

@@ -1,9 +1,9 @@
-name: Deploy Flamincogk Docs site
+name: Deploy Flamingock Docs site
 
 on:
   push:
     branches:
-      - master 
+      - master
 
 jobs:
   deploy:
@@ -18,11 +18,11 @@ jobs:
           node-version: 18  # or 20
 
       - name: Install dependencies
-        run: npm ci
+        run: yarn install --frozen-lockfile
 
       - name: Deploy website
         env:
           GIT_USER: github-actions[bot]
           GIT_EMAIL: github-actions[bot]@users.noreply.github.com
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: npm run deploy
+        run: yarn deploy