Merge pull request #74 from thomasgohard/gh-pages

Fixed capitalisation of 'séances'.
Update breakout-sessions.html

Added new presentation buttons for four sessions.
Update seances-en-ateliers.html

Adding presentation button links for 4 sessions.
Merge pull request #75 from sboots/patch-1

Update breakout-sessions.html
Merge pull request #76 from sboots/patch-2

Update seances-en-ateliers.html
Minor corrections to the breakout sessions section.