Revert "seminars: add summary reading"

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doc/src/development/seminars.md

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-# Seminars
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-Upcoming:
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- Date         | Title                                                                                                             | Detail
- 08-18        | Reading of a summary of Manifesto for a Democratic Civilization Volume I: Civilization and text based discussion  | One of us will share their summary of some of the points raised in the book. We can later have a discussion about the points raised in the summary or from the book. Highly recommend you give the book a read for the discussion to be fruitful. Discussion happens on ircd/darkirc #philosophy
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