Add dholbert to remote attendee list

Author: dholbert

planning/berlin-2026/index.md

@@ -63,6 +63,7 @@ Please list your availability in Berlin time (morning/afternoon/all or specific
 
 | Name | Timezone | CEST Availability | Other Notes |
 | --- | --- | --- | --- |
+| Daniel Holbert | PDT | 8:00-10:00, 15:00-19:00 | |
 | Noam Rosenthal | BST | All | |
 | Stephen Chenney | EDT | 14:00-19:00 | |
 | Tantek Çelik | PDT | 16:00-19:00 | https://tantek.com/ |