Documentation Bookmarks for Help DOCs but "in" the Editor

[ucmRich]

I think it would be greatly helpful to add a Bookmarks feature right inside the editor, especially for people new to the engine.

I also think by default there should be a initial first bookmark for "Nodes" as this is the key to helping newcomers get a quick grasp of how things work.

Allowing for bookmarks to be managed (moved around/deleted and organized into sub folders) would be greatly helpful specifically for devs who think in different or non-traditional ways.