Create mkdocs-decommission task

Task 12 migration.

Date: 2026-02-16

docs/tasks/mkdocs-decommission/README.md

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+# MkDocs Decommission
+
+**Status:** Ready  
+**Priority:** Tier 3 - Cleanup  
+**Time:** 15 minutes  
+**Last Updated:** 2026-02-16
+
+## Overview
+Decommission MkDocs (replaced by Wiki.js). Remove container, clean up files, update DNS.
+
+## Steps
+1. Stop MkDocs container
+2. Remove container and images
+3. Delete MkDocs files
+4. Update/remove DNS record
+5. Document decommission
+
+## Success Criteria
+- ✅ MkDocs container removed
+- ✅ Files cleaned up
+- ✅ DNS updated
+- ✅ Wiki.js confirmed as replacement
+
+**Fire + Frost + Foundation** 💙🔥❄️