Variable "menu" in "sections" umbenannt und Section-Handling vereinfacht

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.withbackground .content > .marginal
{
  border-top: .166666666666em solid @hintergrund; /** 2px */
}
#bs1
{
  top: -2%;
  left: 57%;
}
#bs2,
#bs6
{
  display: none;
}
#bs7
{
  top: 32%;
  left: 46%;
}