removing MathJax submodule since this seems to break github pages
removing no longer used gitmodules file
Squashed 'js/MathJax/' content from commit f3aaf3a

git-subtree-dir: js/MathJax
git-subtree-split: f3aaf3a2a3e964df2770dc4aaaa9c87ce5f47e2c
Merge commit '0e60b1571815230bddbb4dbf75d1bbac433c8ecc' as 'js/MathJax'