docs: More troubleshooting tips (starting from scratch; broken outline) (#1141)

Author: timmc-edx

docs/troubleshoot_general_tips.rst

@@ -220,7 +220,9 @@ Demo course is empty in studio
 ------------------------------
 After provisioning and opening Studio, you may see an empty outline for the demo course. This usually means there is a disconnect between the block ids in mySQL and the corresponding data in Mongo.
 
-To fix, simply add a new subsection and publish. The act of publishing should reload the whole course correctly.
+To fix this locally, simply add a new subsection and publish. The act of publishing should reload the whole course correctly.
+
+See https://github.com/openedx/devstack/issues/1073 for the GitHub issue tracking this bug.
 
 CORS error from login_refresh in MFE
 ------------------------------------
@@ -243,6 +245,14 @@ See `the github issue`_ to follow the work being done on the resolution.
 .. _the github issue: https://github.com/openedx/devstack/issues/1072
 
 
+Starting From Scratch
+=====================
+
+If you think your devstack is broken beyond repair, you can start from scratch using ``make dev.destroy``, followed by the :doc:`getting_started` instructions.
+
+If you want to make absolutely sure that there are no lingering data volumes after the ``dev.destroy`` step, run ``docker volume ls --quiet | grep devstack`` -- if you see surviving devstack volumes that are currently mentioned in docker-compose.yml, there may be a bug. If you can reproduce the issue reliably, consider `reporting an issue <Reporting New Issues_>`_.
+
+
 Reporting New Issues
 ====================