Move troubleshooting to subcategory w/ new diagnosing stub

content/tutorials/manage-the-rippled-server/troubleshooting/diagnosing-problems.md

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+# Diagnosing Problems with rippled
+
+If you have having problems with `rippled`, the first step is to collect more information to accurately characterize the problem. From there, it can be easier to figure out a root cause and a fix.
+
+If your server does not start, see [rippled Server Won't Start](server-wont-start.html) for a list of some possible causes and fixes.
+
+The remainder of this document suggests steps for diagnosing the problem if your server starts successfully.
+
+## Get the server_info
+
+```
+rippled server_info
+```
+
+TODO: explanation of which parameters to look at first
+
+## Check the server log
+
+TODO: for which messages? Any specific warnings to look out for?