Add Paligo as a sponsor (#2393)

Author: ericholscher

docs/_data/berlin-2025-config.yaml

@@ -200,6 +200,9 @@ sponsors:
     - name: kapa-ai
       link: https://www.kapa.ai/?ref=writethedocs
       brand: Kapa.ai
+    - name: paligo-new
+      link: https://paligo.net?utm_source=write_the_docs_berlin_2025&utm_medium=sponsored_conference
+      brand: Paligo
   publisher:
   second:
   first: