Update git remote URL from git.threefold.info to git.ourworld.tf

specs/models/calendar/calendar.v

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+module calendar
+
+import freeflowuniverse.herolib.hero.models.core
+
+// Calendar represents a calendar with events and scheduling capabilities
+pub struct Calendar {
+	core.Base
+pub mut:
+	name        string @[index]
+	description string
+	color       string // hex color code
+	timezone    string
+	owner_id    u32 @[index]
+	is_public   bool
+}