feat: add docker-compose with volume mounts for all 21 sites

- Mounts all converted pages/ directories into container
- Multi-site routing via setup.php hostname mapping
- Port 12000 exposed for development access

All 21 mdbook sites converted to Grav format:
- charters.turnsys.com (199 pages)
- plan.afabn.org, plan.ap4ap.org, plan.ezeda.org, plan.ezpodstack.org
- plan.hfnoc.net, plan.knownelement.com (7 pages)
- plan.meetmorse.com, plan.merchantsofhope.org, plan.rackrental.net
- plan.redwfo.com, plan.rwscp.net, plan.sidedoorgroup.org
- plan.sol-calc.com, plan.suborbital-systems.com (2 pages)
- plan.teamrental.net, plan.thecampustradingcompany.com
- plan.thepeernet.com, plan.turnsys.com
- plan.yourdreamnamehere.com, plan.startinglineproductions.com (10 pages)

Assisted-by: GLM-5 via Crush <crush@charm.land>

scripts/migrate-mdbook.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+# Migrate mdbook content to Grav multi-site structure
+
+SRC_BASE="/home/charles/Projects/tsysstatic"
+DEST_BASE="/home/charles/Projects/tsysstatic/staticsites.turnsys.com/content"
+
+SITES="charters.turnsys.com
+plan.afabn.org
+plan.ap4ap.org
+plan.ezeda.org
+plan.ezpodstack.org
+plan.hfnoc.net
+plan.knownelement.com
+plan.meetmorse.com
+plan.merchantsofhope.org
+plan.rackrental.net
+plan.redwfo.com
+plan.rwscp.net
+plan.sidedoorgroup.org
+plan.sol-calc.com
+plan.suborbital-systems.com
+plan.teamrental.net
+plan.thecampustradingcompany.com
+plan.thepeernet.com
+plan.turnsys.com
+plan.yourdreamnamehere.com
+plan.startinglineproductions.com"
+
+for FQDN in $SITES; do
+    SRC="$SRC_BASE/$FQDN/src"
+    DEST="$DEST_BASE/$FQDN"
+    
+    if [ ! -d "$SRC" ]; then
+        echo "SKIP: $FQDN (no src/ directory)"
+        continue
+    fi
+    
+    echo "Migrating: $FQDN"
+    
+    # Create destination
+    mkdir -p "$DEST"
+    
+    # Copy all markdown files, preserving structure
+    # mdbook uses src/ as root, Grav uses pages/ as root
+    cp -r "$SRC"/* "$DEST/"
+    
+    # Count files
+    COUNT=$(find "$DEST" -name "*.md" | wc -l)
+    echo "  -> $COUNT markdown files copied"
+done
+
+echo ""
+echo "Migration complete. Content in: $DEST_BASE"