Move features to Markdown content model

website/src/features/macros.md

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+---
+title: Macros and Variables
+icon: ⚡
+category: Operator Speed
+since: "1.0"
+summary: Send recurring contest messages faster with configurable macros and variables.
+description: Macros reduce repetitive typing and help operators respond quickly during active ON4KST contest sessions.
+tagsList:
+  - macros
+  - ON4KST
+  - operator workflow
+related:
+  - sked-reminder
+  - dual-chat
+---
+
+## Faster messages
+
+Macros reduce repetitive typing during active contest operation.
+
+## More consistent operation
+
+Variables help keep messages structured and reduce manual errors.