Migrate CI workflows from npm to yarn

Author: Mahmoudz

.github/workflows/deploy.yml

@@ -17,13 +17,13 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-node@v3
         with:
-          node-version: 18.x
-          cache: npm
+          node-version: 20.x
+          cache: yarn
 
       - name: Build docs
         run: |
-          npm ci
-          npm run build
+          yarn install --frozen-lockfile
+          yarn build
 
       # Popular action to deploy to GitHub Pages:
       # Docs: https://github.com/peaceiris/actions-gh-pages#%EF%B8%8F-docusaurus

.github/workflows/test-deploy.yml

@@ -13,10 +13,10 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v3
         with:
-          node-version: 18.x
-          cache: npm
+          node-version: 20.x
+          cache: yarn
 
       - name: Test build
         run: |
-          npm ci
-          npm run build
+          yarn install --frozen-lockfile
+          yarn build