Use doctests for guide (#2623)

* Use doctests for arrays.rst

* Use doctests for attributes.rst

* Use doctests for config.rst

* Use doctests for consolidated metadata

* Use doctests for groups.rst

* Use doctests for preformance.rst

* Use doctests for storage.rst

* Remove ipython config for docs

* Fix performance doctest output

* Enable doctests

Author: dstansby

docs/conf.py

@@ -49,8 +49,6 @@
     "sphinx_copybutton",
     "sphinx_design",
     'sphinx_reredirects',
-    "IPython.sphinxext.ipython_directive",
-    "IPython.sphinxext.ipython_console_highlighting",
 ]
 
 issues_github_path = "zarr-developers/zarr-python"