doc: update to sphinx_rtd_theme 1.0

The sphinx_rtd_theme 1.0 includes simplified configuration for Google
analytics, along with general fixes and improvements.

Anyone publishing project documentation to projectacrn.github.io must be
using this updated sphinx_rtd_theme for Google Analytics data to be
properly collected.

* Switch to use this new theme version, and clean up the previous method
  of collecting analytics data.
* Update requirements.txt to use this new theme version. Update the
  show-versions.py script (used to report on installed doc building tools)
  to also report if there's a mismatch on which version is expected (in
  requirements.txt) and what's currently installed.

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>

doc/scripts/requirements.txt

@@ -1,5 +1,5 @@
 breathe==4.23.0
 sphinx==3.2.1
 docutils==0.16
-sphinx_rtd_theme==0.5.0
+sphinx_rtd_theme==1.0
 sphinx-tabs==1.3.0

doc/scripts/show-versions.py

@@ -32,6 +32,9 @@ for reqs in pkg_resources.parse_requirements(rf):
     try:
         ver = pkg_resources.get_distribution(reqs.project_name).version
         print ("  " + reqs.project_name.ljust(25," ") + " version: " + ver)
+        if not reqs.__contains__(ver):
+            print (color.RED + color.BOLD + "   >>> Warning: Expected version " +
+                    reqs.__str__() + " Python module from scripts/requirements.text." + color.END)
     except:
         print (color.RED + color.BOLD + reqs.project_name + " is missing." + color.END +
                 " (Hint: install all dependencies with " + color.YELLOW +