[[ctx/name]] is the key of a scrap in a folder: the folder path, then the
file name without .md. It tells apart scraps whose file names are the same
in different folders.
[[DDD/Service]]
[[Kubernetes/Service]]
A key is written from the wiki root, not relative to the linking scrap. Context depth is bounded at 3 segments. Combine with Alias when you want a different display text.