Improve accessibility according to automated reports
According to a11y accessibility checker reports, accessibility on several points need to be improved.
A bit hard to identify what a root causes. This list will presumably grow.
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Helmholtz green text has too low contrast. E.g. first headline here according to Error 8 here -
Multiple double id attributes, possibly because of re-using of same elements in header and footer (?), using <svg class="transition_slope">
blocks 2 to 3 times. - ...?
Remaining errors should be explainable as either issues to be solved or checker artifacts by Sept 23.
Further general accessibility things are addressed in separate issues.