Doc. Fix mathjax url to use https instead of http

doc/source/conf.py

@@ -33,6 +33,8 @@ on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
 if not on_rtd:
     extensions.append('oslosphinx')
 
+mathjax_path = 'https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'
+
 # autodoc generation is a bit aggressive and a nuisance when doing heavy
 # text edit cycles.
 # execute "export SPHINX_DEBUG=1" in your terminal to disable