remove whitespace

Author: jhdark

book/README.md

@@ -19,7 +19,6 @@ exports:
 To find all the recordings from the conference please go to [OSSFE-conf@YouTube](https://www.youtube.com/@OSSFE-conf).
 
 Click the video below to start the first recorded talk.
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 :::{iframe} https://www.youtube.com/watch?v=T40j9SAZJ78&list=PLJ8a1YJxx2xaWwbuqoHIHUeI_xCITB6Ql
 :width: 100%
 OSSFE 2025 YouTube Playlist