Docs: Stop importing 'skyfield' in Sphinx conf.py

documentation/conf.py

@@ -57,12 +57,9 @@
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
-#
-# The short X.Y version.
-import skyfield
-version = skyfield.__version__
-# The full version, including alpha/beta/rc tags.
-release = skyfield.__version__
+
+version = 'VERSION_HERE'    # This is never used; verify by grepping for
+release = version           # this string in the output compiled docs.
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.