fix: Make sure entrypoint works without user-provided configuration

docker/entrypoint.sh

@@ -33,13 +33,14 @@ chown -R "$EXT_UID:$EXT_GID" /home/appuser
 # Patch mkdocs configuration 
 # set -x
 if [ -f mkdocs-patch.yml ]; then
-  # bash
+  # patch reference mkdocs with user-provided options
   yq eval-all '. as $item ireduce ({}; . * $item)' \
     mkdocs-source.yml \
     mkdocs-patch.yml \
     > mkdocs.yml
 else
-	cp mkdocs-patch.yml mkdocs.yml
+  # use reference mkdocs only (no options)
+  ln -s mkdocs-source.yml mkdocs.yml
 fi
 # set +x