make slides more readable

Based on !740

I did not change the title, as we use the cards heading for this.
If there is a reason to change it imho we should do the changes in the card.

I created a pipe which replaces every dot followed by a whitespace with a dot followed by a newline. Imho there should not be too many possible false positives.

I did not see a point in splitting it into different spans or similar. If we ever want to add bulletpoints we would need to change it a bit though.

Closes #812 (closed)