feat: support leaf bundles for blog posts, refactor header images

content/blog/2025-12-openrailday-moderation/index.md

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+---
+title: "OpenRail Day 2025 Moderation"
+date: 2025-12-17
+categories:
+  - english
+  - presentation
+tags:
+  - OpenRail
+  - OSPO
+  - Community
+headerimage:
+  src: openrailday-stage.jpg
+  text: My amazing co-moderator Kira Correll and I on stage
+video: https://clip.place/w/p/gZ1HFxLxHri8mDABzqpGHC
+event:
+  name: OpenRail Day 2025 @ Paris
+  href: https://day.openrailassociation.org
+---
+
+I had the pleasure to moderate the OpenRail Day 2025 in Paris, organised by the [OpenRail Association](https://openrailassociation.org) to share knowledge and experiences about open source software in the railway industry. The event featured several talks and panel discussions with experts from different companies and organisations involved in open source projects related to railways.
+
+![](openrailday-stage.jpg)