Foldable / hiding improvement

[clecap]

We want to further improveme folding.

Idea 1: When we open the page all sections should be folded / hidden automagically. For the annoyances pages this would be very helpful and for all pages where we have overiews we visit only rarely. Maybe implement via magic word. Maybe implement using UI element. Maybe implement using => = instead of = = for a title.

Idea 2: We want to makr certain sections as opening hidden /folded. Again an idea could be to encode this into the heading, as with ==> heading == or ==- Heading == Or ==^ Heading ==.