Update README.md

fixing link

Co-authored-by: Vitor Mattos <[email protected]>
Signed-off-by: yharroch <[email protected]>

Author: yharroch

README.md

@@ -127,7 +127,7 @@ LibreSign manages its own internal Certificate Authority (CA), ensuring full con
 
 ## API Documentation
 
-Developer manual: https://docs.libresign.coop/developer_manual/index.html
+Developer manual: https://docs.libresign.coop/developer_manual/
 
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