Update build.yml

Author: dluo

.github/workflows/build.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Install yarn deps
         run: cd website && yarn install
       - name: build
-        working-directory: ./pyre2/website
+        working-directory: pyre2/website
         run: scripts/build.sh
       - name: Deploy to GitHub Pages
         id: deployment