remove redundant github action

.github/workflows/sorting_non_recursive_merge_sort.yml

@@ -1,24 +0,0 @@
-name: sorting_non_recursive_merge_sort
-on:
-  pull_request:
-  push:
-  #  branches: [master]
-jobs:
-  sorting_non_recursive_merge_sort:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@master
-      - uses: mattnotmitt/doxygen-action@master
-        with:
-          working-directory: 'sorting/'
-          doxyfile-path: 'doxy.txt'
-      #- uses: peaceiris/actions-gh-pages@v3
-      #  with:
-      #    github_token: ${{ secrets.GITHUB_TOKEN }}
-      #    publish_dir: ./sorting
-      #    external_repository: TheAlgorithms/C-Plus-Plus
-      #    publish_branch: master
-      #    enable_jekyll: true
-      - run: |
-          cd sorting
-          make test