Create started-preview.md

src/docs/started-preview.md

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+# Started Pool with Preview Sets
+If you've been directed to this page, your start.gg pool is bugged.
+
+You may verify this by seeing that despite the pool being shown as started in Replay Manager and various places on start.gg (and possibly even having sets reported), no `Reset Bracket` button is available on the pool's reporting page:  
+![image](https://github.com/user-attachments/assets/ab0a1050-78d0-41c5-8dfd-dc056393fe9b)
+
+One known fix is to reset the whole phase from the `Bracket Setup` page:  
+<img width="276" alt="image" src="https://github.com/user-attachments/assets/30eac6c5-4458-4cf4-a9a4-e5e97c9db31b">  
+![image](https://github.com/user-attachments/assets/564c0aa2-8bfc-4e8e-9584-a8b50a93c17c)