Remove reveal.js
Squashed 'static/lib/reveal.js/' content from commit 9da952f

git-subtree-dir: static/lib/reveal.js
git-subtree-split: 9da952fea30906090446d038430186b11dba7f13
Merge commit '3cdfe197c9d673965df2d1517ad68f1177480896' as 'static/lib/reveal.js'