Reorganized Docs. In Progress.

docs/DragDrop/Drag-Drop.md

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+## Roles
+
+It depends on role of user what drag drop is allowed https://github.com/wekan/wekan/wiki/REST-API-Role
+
+## Mobile Drag Drop
+
+1. Click `Drag Handle Enabled/Disabled` button to enable drag handles
+
+2. Use drag handles to move Board Icons, Swimlanes, MiniCards, Lists, Checklists, Checklist Items.
+
+3. Use non-drag-handle area to to view other parts of board, by dragging board up/down/left/right, without moving any icons etc.
+
+<img src="https://wekan.github.io/dragdrop/mobile-drag-drop.png" width="40%" alt="Wekan logo" />
+
+## 2 or more external screens of desktop or mobile
+
+For each screen, you can enable or disable drag handles, because that setting is stored in browser localstorage, not to database. https://github.com/wekan/wekan/issues/4715
+
+Because this feature was added, `Drag Handle Enabled/Disabled` was moved to current place shown in above screenshot. https://github.com/wekan/wekan/issues/4734
+
+## All Boards page
+
+Reorder with drag drop:
+- Board Icons
+
+## One Board page
+
+Reorder with drag drop:
+
+- Swimlanes
+- Lists
+- MiniCards. MiniCard is card, that is not click opened to view card contents.
+- Opened Card: Checklists
+- Opened Card: Checklist Items
+
+## Drag code examples
+
+- Draggable objects
+  - https://www.redblobgames.com/making-of/draggable/
+  - https://news.ycombinator.com/item?id=37703291
+- Fixed Drag at Ubuntu Touch Morph browser https://github.com/wekan/wekan/commit/af63259f091cb2ade84493a288ea37c53cd37321