update installation step of workflow

Author: stephprince

.github/workflows/check_sphinx_links.yml

@@ -29,7 +29,6 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install -r requirements-doc.txt
-          python -m pip install .
 
       - name: Check Sphinx links and references
         run: sphinx-build -n -b linkcheck ./docs/format/source ./test_build