[FEATURE] Update Rotosolve demo

[dwierichs]

The Rotosolve demo should cite all four of the independently inventing papers:

Vidal and Theis, 2018
Nakanashi, Fujii and Todo, 2019 (or PRResearch)
Parrish, Iosue, Ozaeta and McMahon, 2019
Ostaszewski, Grant and Benedetti, 2019 (or Quantum)

It should include use cases for the recent generalizations:

1. Generalization to all integral frequency spectra #1489 and
2. Generalization to arbitrary frequency spectra (planned) #2058)