Add GPL3 license explanations
Revert "Keep tilting"

This reverts commit 49e03a45437d9a22088441e4ff5e1198b42d7b7c.
Revert "Change background of Uninav when clicking topic"

This reverts commit 3ba2ca213a1f9d76920060a816d042c674495062.
Style: Font Helvetica
multi-parenting: taxonomy.json
multi-parenting: adapt JSON loading
horizontal scrolling
page with <iframe> content

automatic height not yet working
index: height using flexbox

Doesn't work in MSIE < 11
Start node
Open topic, not tile
2 bugfixes for the last commits
Change <title>