I wanted to check out Node-Red so I installed it via openhabian-config but now there is no way to uninstall it from openhabian-config. What is the proper uninstall procedure? Thanks!
To delete
sudo npm remove -g node-red node-red-admin
rm -R ~/.node-red
There are helper scripts into /usr/bin - go in there and delete anything node-red*
You can also check /usr/lib/node_modules - may be some remnants in there - If you aren’t using any other nodejs app you can safely delete them as well.
If you have run it - there will also be your own ~/.node-red directory which contains any flows you have created so far. - Up to you if you want to delete them or leave them for next time.
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That worked! Thanks.
humm. Looks like http://openhab:8080/start/index still has a link to Node-Red and clicking the link which points to http://openhab:1880 still serves up a page (although broken and mostly empty) and not a 404.
Anyone have any idea where that start page configuration is?
The command
which node-red-start
This will tell you where you can delete it. Most likely in /lib/systemd/system delete with the next command.
rm -rf /lib/systemd/system/nodered.service
There may always be something left on the raspberry.
Here is the solution that worked for me. Thanks to everyone to helped figure this out. 
Stop, uninstall and remove the systemd file
sudo /usr/bin/node-red-stop
sudo npm remove -g node-red node-red-admin
sudo rm /lib/systemd/system/nodered.service
Remove the panel from the dashboard.config
Delete the three lines prefixed with node-red
nano /var/lib/openhab2/config/org/openhab/dashboard.config
Restart OpenHAB
sudo /bin/systemctl stop openhab2.service
sudo openhab-cli clean-cache (not sure if this is necessary)
sudo /bin/systemctl stop openhab2.service
NOTE: My understanding is editing $OPENHAB_CONF/services/dashboard.cfg has absolutely no effect on the dashboard, except the FIRST time you boot. Just like $OPENHAB_CONF/services/addons.cfg which actually has a comment at the top stating this.
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