Move docs from book/ to docs/ (#8469)

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docs/src/running-validator/validator-troubleshoot.md

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+# Troubleshooting
+
+There is a **\#validator-support** Discord channel available to reach other
+testnet participants, [https://discord.gg/pquxPsq](https://discord.gg/pquxPsq).
+
+## Useful Links & Discussion
+* [Network Explorer](http://explorer.solana.com/)
+* [Testnet Metrics Dashboard](https://metrics.solana.com:3000/d/testnet-edge/testnet-monitor-edge?refresh=60s&orgId=2)
+* Validator chat channels
+  * [\#validator-support](https://discord.gg/rZsenD) General support channel for any Validator related queries.
+  * [\#tourdesol](https://discord.gg/BdujK2) Discussion and support channel for Tour de SOL participants ([What is Tour de SOL?](https://solana.com/tds/)).
+  * [\#tourdesol-announcements](https://discord.gg/Q5TxEC) The single source of truth for critical information relating to Tour de SOL
+  * [\#tourdesol-stage0](https://discord.gg/Xf8tES) Discussion for events within Tour de SOL Stage 0. Stage 0 includes all the dry-run
+* [Core software repo](https://github.com/solana-labs/solana)
+* [Tour de SOL Docs](https://docs.solana.com/tour-de-sol)
+* [TdS repo](https://github.com/solana-labs/tour-de-sol)
+* [TdS metrics dashboard](https://metrics.solana.com:3000/d/testnet-edge/testnet-monitor-edge?refresh=1m&from=now-15m&to=now&var-testnet=tds&orgId=2&var-datasource=TdS%20Metrics%20%28read-only%29)
+
+Can't find what you're looking for? Send an email to ryan@solana.com or reach out to @rshea\#2622 on Discord.