Squashed 'reveal.js/' changes from 8c2be2f..8026dfc

8026dfc find correct path to open html file from the notes.js path
REVERT: 8c2be2f find correct path to open html file from the notes.js path

git-subtree-dir: reveal.js
git-subtree-split: 8026dfc4f3cda6c4e751c76cbd8b58b777cddc51
Merge commit '373ee9d9891242792d90d9832f14860f0ddf0d8a' into gh-pages