fix: change package manager for installation to pnpm with its affiliated lockfile

.github/workflows/deploy.yml

@@ -13,10 +13,10 @@ jobs:
 
             - name: Install dependencies and build/compile the site # This example project is built using npm and outputs the result to the 'build' folder. Replace with the commands required to build your project, or remove this step entirely if your site is pre-built.
               run: |
-                  yarn install --frozen-lockfile
-                  yarn prepare
-                  yarn lint
-                  yarn docs:build
+                  pnpm install --frozen-lockfile
+                  pnpm prepare
+                  pnpm lint
+                  pnpm docs:build
             - name: Deploy to GitHub pages
               uses: JamesIves/github-pages-deploy-action@v4
               with: