Remove old build workflow and update README with new workflow link

.github/workflows/build_v2.yml

@@ -253,6 +253,7 @@ jobs:
         uses: softprops/action-gh-release@v2
         with:
           tag_name: ${{ github.event.inputs.tag }}
+          draft: true
           files: |
             ${{ github.workspace }}/artifacts/**/*.zip
             ${{ github.workspace }}/artifacts/**/*.tar.gz