Use .content for Sphinx

Because sphinx stores some output in datacontainer that need to be instantiated

pyiron_atomistics/sphinx/interactive.py

@@ -376,14 +376,14 @@ def check_band_occupancy(self, plot=True):
         import matplotlib.pylab as plt
 
         try:
-            elec_dict = self._job.project_hdf5["output/generic/dft"]["n_valence"]
+            elec_dict = self._job.content["output/generic/dft"]["n_valence"]
         except ValueError:
             raise AssertionError("Number of electrons not parsed") from None
         n_elec = np.sum(
             [elec_dict[k] for k in self._job.structure.get_chemical_symbols()]
         )
         n_elec = int(np.ceil(n_elec / 2))
-        bands = self._job.project_hdf5["output/generic/dft/bands_occ"][-1]
+        bands = self._job.content["output/generic/dft/bands_occ"][-1]
         bands = bands.reshape(-1, bands.shape[-1])
         max_occ = np.sum(~np.isclose(bands, 0), axis=-1).max()
         n_bands = bands.shape[-1]