resolve docs build error my re-ordering plugins. great stuff, sphinx

Author: d-v-b

docs/conf.py

@@ -38,14 +38,14 @@
 extensions = [
     "sphinx.ext.autodoc",
     "sphinx.ext.autosummary",
-    "sphinx.ext.viewcode",
     "sphinx.ext.intersphinx",
     'autoapi.extension',
     "numpydoc",
     "sphinx_issues",
     "sphinx_copybutton",
     "sphinx_design",
     'sphinx_reredirects',
+    "sphinx.ext.viewcode",
 ]
 
 issues_github_path = "zarr-developers/zarr-python"