Fixed dependancies warnings introduced by sphinx_toolbox (#1339)

* Added versioning for sphinx, docutils - introduced by sphinxtoolbox

* Fixed bug with config value for `plot_gallery` in doc makefile

* Update linkcheck command as well

Author: eddiebergman

setup.py

@@ -41,11 +41,12 @@
         "seaborn",
     ],
     "docs": [
-        "sphinx",
-        "sphinx-gallery<=0.10.0",
+        "sphinx<4.3",
+        "sphinx-gallery",
         "sphinx_bootstrap_theme",
         "numpydoc",
         "sphinx_toolbox",
+        "docutils==0.16"
     ],
 }