Feature request: graph view among notes

[jiadongdan]

Hi, dear Hackmd team

Hackmd is really a super nice tool for online notetaking. I am just wondering if graph view of notes can be considered for future features. More details of this feature has been implemented in this app -- Obsidian. I know it won't be easy for adding this wonderful feature, but if this is added into hackmd, the whole system will be fantastic :)

[jackycute]

Good idea, PR welcome!