explanatory texts for each step/panel of the app

[Coorsaa]

[florianfendt]

You self assigned. Do you want to work on this on your own?
Otherwise I'll also add some stuff while I improve the report section since that is kind of connected I guess.

[Coorsaa]

done by PR #101 . However @florianfendt, it would be great if you could change the text for the report section into a more detailed one. Hence I let this issue open for now.