Split out content to many smaller files

And add markmaker.py to generate workshop.md

docs/nodeinfo.md

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+class: node-info
+
+## Getting task information for a given node
+
+- You can see all the tasks assigned to a node with `docker node ps`
+
+- It shows the *desired state* and *current state* of each task
+
+- `docker node ps` shows info about the current node
+
+- `docker node ps <node_name_or_id>` shows info for another node
+
+- `docker node ps -a` includes stopped and failed tasks