Start with requested Layout changes

[mcwimm]

• [x] About
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• [x] Data upload
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• [x] Hydro T
  • [ ] new figure
• [x] Hydro R
• [x] Hydro C
  • [ ] new figure
  • [ ] test for significance
  • [ ] new text

[mcwimm]

figures, test and stats. are dealt with in other PRs.

@cailadd90 Could you please check if everything from your list is covered and test if everything works prtoperly? If so, it's ready to be merged.