Specified the UI theme used in the screenshots #32
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It seems the UI theme used in the screenshots of the code is One Dark; I specified that in a caption after the screenshots, just for the benefit of people wanting to recreate the look of this theme and to whom it wasn't obvious that the UI theme was One Dark (like me).
(I know this theme is deprecated but no harm in adding extra documentation to preserve it for future users who still wanna use it)