chore: add halfstack, fodem, and sotb to events

Author: ghostdevv

src/assets/events/2025-11-12-halfstack-london.jpg

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+{
+	"name": "HalfStack London 2025",
+	"place": "in-person",
+	"type": "conference",
+	"url": "https://halfstackconf.com/london",
+	"thumbnail": "$assets/events/2025-11-12-halfstack-london.jpg",
+	"start": "2025-11-12T10:00:00+00:00",
+	"end": "2025-11-12T22:00:00+00:00"
+}

src/assets/events/2026-01-31-fosdem.jpg

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+{
+	"name": "FOSDEM 2026",
+	"place": "hybrid",
+	"type": "conference",
+	"url": "https://fosdem.org/2026/",
+	"thumbnail": "$assets/events/2026-01-31-fosdem.jpg",
+	"start": "2026-01-31T09:30:00+01:00",
+	"end": "2026-02-01T21:18:15+01:00"
+}

src/assets/events/2026-02-28-state-of-the-browser.jpg

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+{
+	"name": "State of the Browser 2026",
+	"place": "hybrid",
+	"type": "conference",
+	"url": "https://2026.stateofthebrowser.com/",
+	"thumbnail": "$assets/events/2026-02-28-state-of-the-browser.jpg",
+	"start": "2026-02-28T09:30:00+00:00",
+	"end": "2026-02-28T17:00:00+00:00"
+}