Remove duplicated 'Here is the weekly series:' line from intro

The phrase appeared twice near the top of the README with a blank-line gap between them, which likely came from an earlier merge. Keep only the first occurrence.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -6,10 +6,6 @@ At DAIR.AI we ❤️ reading AI papers so we've created this repo to highlight t
 
 Here is the weekly series:
 
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-Here is the weekly series:
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 ## 2026
 - [Top AI Papers of the Week (April 6 - April 12)](#top-ai-papers-of-the-week-april-6---april-12---2026)
 - [Top AI Papers of the Week (March 30 - April 5)](#top-ai-papers-of-the-week-march-30---april-5---2026)