docs: remove incorrect redirect (#3801)

Author: maxrjones

mkdocs.yml

@@ -216,7 +216,6 @@ plugins:
         'developers/index.html.md': 'contributing.md'
         'developers/roadmap.html.md': 'https://zarr.readthedocs.io/en/v3.0.8/developers/roadmap.html'
         'api/zarr/creation.md': 'api/zarr/deprecated/creation.md'
-        'api/zarr/codecs/numcodecs.md': 'api/zarr/deprecated/creation.md'
         'api.md': 'api/zarr/index.md'
         'api/zarr/metadata/migrate_v3.md': 'api/zarr/metadata.md'