Support subdirs for namespace hierarchy

[alex0]

@Gary_O

Did you see this reply by one of the Logseq devs?

Proposal: Changing How Namespaces Function in Logseq

Yes. Our vision is to separate namespace structure from the limited tree structure of file system. Namespace is for concept disambiguation. Creating sub-dir by default would imply that every page should have a namespace (sub-dir), which violates our design. Besides, the namespace file naming is going to be changed in Feat: new file name escaping rules by cnrpman · Pull Request #6134 · logseq/logseq · GitHub @Gary_O title:: property is providing a “manual” way to manipulate the namespace stru…

“Namespaces are for content disambiguation”.