quincy: doc/dev: remove seqdiag assets

[zdover23]

Remove seqdiag assets to determine whether the docs can be built if they are absent. (Currently they cannot be built when they are present.) If this works, then these diagrams will be replaced, probably with .png files.

Signed-off-by: Zac Dover zac.dover@proton.me
(cherry picked from commit ce96ddd)

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