remove artifact, pages alone is fine actually

.gitea/workflows/build.yaml

@@ -36,8 +36,3 @@ jobs:
             -T ./presentation.zip \
             -H "Content-Type: application/zip" \
             -H "Authorization: Pages ${{ secrets.GIT_PAGES_TOKEN }}"
-      - name: upload presentation folder
-        uses: https://gitea.com/actions/gitea-upload-artifact@v4
-        with:
-          name: presentation
-          path: presentation.zip