Update index.html

update window title
decrease title font
Merge pull request #24 from jphilippe-grenoble/patch-1

Update index.html
Merge pull request #25 from jphilippe-grenoble/patch-2

decrease title font
Merge branch 'master' of github.com:InnovaLangues/tree-proto-angular
Little changes in index.php (title and indent)
Step editor
modify navbar