Merge pull request #206 from libAtoms/docs_syntax_highlight

Add ipython to docs.yml for syntax highlighting

.github/workflows/docs.yml

@@ -44,7 +44,7 @@ jobs:
         run: conda install -c conda-forge phono3py h5py
 
       - name: Install dependencies from pip (some will already be taken care of by conda's phonop3py and its dependencies)
-        run: pip install wheel setuptools ase numpy scipy click matplotlib pandas pyyaml spglib phonopy phono3py rdkit-pypi flake8 pytest pytest-cov nbsphinx
+        run: pip install wheel setuptools ase numpy scipy click matplotlib pandas pyyaml spglib phonopy phono3py rdkit-pypi flake8 pytest pytest-cov nbsphinx ipython
 
       - name: Install Quippy from PyPI
         run: pip install quippy-ase