Added newlines to index.md for the 2026-January meetup

Author: sunito

index.md

@@ -3,7 +3,9 @@
 ## Upcoming events
 
 Our next meetup will be on **January 20th** at 6:30 or 7 pm. 
+
 As usual, at [WIAS](https://www.wias-berlin.de/). The main entrance is currently closed due to construction work, so you will have to enter from the back .
+
 At the entrance, there is a registration book for guests. Enter Dr. Fuhrmann as the person to be visited.
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 Our next meetup will be on **June 17th** at 7 pm. As usual, at [WIAS](https://www.wias-berlin.de/).