chore(combinatorics/young_tableau): move young_diagram.lean into young_tableau directory
Rename combinatorics/young_tableaux directory to combinatorics/young_tableau.
Move combinatorics/young_diagram.lean to combinatorics/young_tableau/young_diagram.lean.
This is to group all topics related to Young tableaux together. Future additions will be in this directory.
What about combinatorics.young.semistandard_tableau/combinatorics.young.diagram?
What about
combinatorics.young.semistandard_tableau/combinatorics.young.diagram?
That would be fine with me as long as it's in keeping with mathlib conventions (which I am not knowledgeable about). I would still prefer to have the objects themselves to be structure young_diagram and structure ssyt.
Thanks!
bors r+
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