Simplified release workflow

- The script does not have any external dependencies, so there is no
  need to use `pip` for the installation.

- Fixed issue with script name.

.github/workflows/create_manifolds_release.yaml

@@ -15,11 +15,10 @@ jobs:
         with:
           python-version: '3.10.11'
           cache: 'pip'
-      - run: pip install -r requirements.txt
 
       - name: Run conversion script
         run: | 
-          sh script/convert_manifold.sh
+          sh scripts/convert_manifold.sh
 
       - name: Create release
         uses: "marvinpinto/action-automatic-releases@latest"