move notes out of year subfolders

uni/mmme/2047_thermodynamics_and_fluid_dynamics/exam_papers/2019-2020/MMME2047-2019-2020-readme.txt

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+This paper is of the format used before covid and therefore is the full year in two parts.
+The length of questions in the part A is appropriate for the January exam, but the content is split between the part A and part B in this exam from 2020.  You should be able to answer Questions 1, 2, 4, 7, 10, 11; and you can usefully attempt questions 13, 16b and 17b