Add event: Day of Data Baton Rouge 2026 (#15)

Closes #13

Auto-generated from community event submission.

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content/calendar/day-of-data-baton-rouge-2026-2026.md

@@ -0,0 +1,9 @@
+---
+endDate: '2026-07-18'
+externalUrl: https://www.dayofdatabr.org/
+startDate: '2026-07-17'
+title: Day of Data Baton Rouge 2026
+virtual: false
+where: Baton Rouge, LA
+---
+A free community event featuring sessions on SQL Server, PowerShell, and data platform technologies. Formerly SQL Saturday.