maybe missing something elementary here. I tried using an existing directory of markdown notes as a vault following instructions in https://wiki.dendron.so/notes/683740e3-70ce-4a47-a1f4-1f140e80b558/#can-i-use-dendron-with-existing-notes , i.e., running Dendron: Change Workspace command in the directory with existing markdown files and I keep getting an error on Mac: "No Dendron workspace found. Please run Dendron: Initialize Workspace to create a workspace at"