rename web3d.html to app.html

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34641 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4368 CardPanel

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34642 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e